c-thiel commented on code in PR #587: URL: https://github.com/apache/iceberg-rust/pull/587#discussion_r1834836340
########## crates/iceberg/src/spec/table_metadata_builder.rs: ########## @@ -0,0 +1,2074 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +use std::collections::{HashMap, HashSet}; +use std::sync::Arc; + +use uuid::Uuid; + +use super::{ + BoundPartitionSpec, FormatVersion, MetadataLog, PartitionSpecBuilder, Schema, SchemaRef, + Snapshot, SnapshotLog, SnapshotReference, SortOrder, SortOrderRef, TableMetadata, + UnboundPartitionSpec, DEFAULT_PARTITION_SPEC_ID, DEFAULT_SCHEMA_ID, MAIN_BRANCH, ONE_MINUTE_MS, + PROPERTY_METADATA_PREVIOUS_VERSIONS_MAX, PROPERTY_METADATA_PREVIOUS_VERSIONS_MAX_DEFAULT, + RESERVED_PROPERTIES, UNPARTITIONED_LAST_ASSIGNED_ID, +}; +use crate::error::{Error, ErrorKind, Result}; +use crate::{TableCreation, TableUpdate}; + +const FIRST_FIELD_ID: u32 = 1; + +/// Manipulating table metadata. +/// +/// For this builder the order of called functions matters. Functions are applied in-order. +/// All operations applied to the `TableMetadata` are tracked in `changes` as a chronologically +/// ordered vec of `TableUpdate`. +/// If an operation does not lead to a change of the `TableMetadata`, the corresponding update +/// is omitted from `changes`. +/// +/// Unlike a typical builder pattern, the order of function calls matters. +/// Some basic rules: +/// - `add_schema` must be called before `set_current_schema`. +/// - If a new partition spec and schema are added, the schema should be added first. +#[derive(Debug, Clone)] +pub struct TableMetadataBuilder { + metadata: TableMetadata, + changes: Vec<TableUpdate>, + last_added_schema_id: Option<i32>, + last_added_spec_id: Option<i32>, + last_added_order_id: Option<i64>, + // None if this is a new table (from_metadata) method not used + previous_history_entry: Option<MetadataLog>, +} + +#[derive(Debug, Clone, PartialEq)] +/// Result of modifying or creating a `TableMetadata`. +pub struct TableMetadataBuildResult { + /// The new `TableMetadata`. + pub metadata: TableMetadata, + /// The changes that were applied to the metadata. + pub changes: Vec<TableUpdate>, + /// Expired metadata logs + pub expired_metadata_logs: Vec<MetadataLog>, +} + +impl TableMetadataBuilder { + const LAST_ADDED: i32 = -1; + + /// Create a `TableMetadata` object from scratch. + /// + /// This method re-assign ids of fields in the schema, schema.id, sort_order.id and + /// spec.id. It should only be used to create new table metadata from scratch. + pub fn new( + schema: Schema, + spec: impl Into<UnboundPartitionSpec>, + sort_order: SortOrder, + location: String, + format_version: FormatVersion, + properties: HashMap<String, String>, + ) -> Result<Self> { + // Re-assign field_ids, schema.id, sort_order.id and spec.id for a new table. + let (fresh_schema, fresh_spec, fresh_sort_order) = + Self::reassign_ids(schema, spec.into(), sort_order)?; + let schema_id = fresh_schema.schema_id(); + + let builder = Self { + metadata: TableMetadata { + format_version, + table_uuid: Uuid::now_v7(), + location: "".to_string(), // Overwritten immediately by set_location + last_sequence_number: 0, + last_updated_ms: 0, // Overwritten by build() if not set before + last_column_id: -1, // Overwritten immediately by add_current_schema + current_schema_id: -1, // Overwritten immediately by add_current_schema + schemas: HashMap::new(), + partition_specs: HashMap::new(), + default_spec: Arc::new( + BoundPartitionSpec::unpartition_spec(fresh_schema.clone()).with_spec_id(-1), + ), // Overwritten immediately by add_default_partition_spec + last_partition_id: UNPARTITIONED_LAST_ASSIGNED_ID, + properties: HashMap::new(), + current_snapshot_id: None, + snapshots: HashMap::new(), + snapshot_log: vec![], + sort_orders: HashMap::new(), + metadata_log: vec![], + default_sort_order_id: -1, // Overwritten immediately by add_default_sort_order + refs: HashMap::default(), + }, + changes: vec![], + last_added_schema_id: Some(schema_id), + last_added_spec_id: None, + last_added_order_id: None, + previous_history_entry: None, + }; + + builder + .set_location(location) + .add_current_schema(fresh_schema)? + .add_default_partition_spec(fresh_spec.into_unbound())? + .add_default_sort_order(fresh_sort_order)? + .set_properties(properties) + } + + /// Creates a new table metadata builder from the given metadata to modify it. + + /// `current_file_location` is the location where the current version + /// of the metadata file is stored. This is used to update the metadata log. + /// If `current_file_location` is `None`, the metadata log will not be updated. + /// This should only be used to stage-create tables. + #[must_use] + pub fn new_from_metadata( + previous: TableMetadata, + previous_file_location: Option<String>, + ) -> Self { + Self { + previous_history_entry: previous_file_location.map(|l| MetadataLog { + metadata_file: l, + timestamp_ms: previous.last_updated_ms, + }), + metadata: previous, + changes: Vec::default(), + last_added_schema_id: None, + last_added_spec_id: None, + last_added_order_id: None, + } + } + + /// Creates a new table metadata builder from the given table creation. + pub fn from_table_creation(table_creation: TableCreation) -> Result<Self> { + let TableCreation { + name: _, + location, + schema, + partition_spec, + sort_order, + properties, + } = table_creation; + + let location = location.ok_or_else(|| { + Error::new( + ErrorKind::DataInvalid, + "Can't create table without location", + ) + })?; + let partition_spec = partition_spec.unwrap_or(UnboundPartitionSpec { + spec_id: None, + fields: vec![], + }); + + Self::new( + schema, + partition_spec, + sort_order.unwrap_or(SortOrder::unsorted_order()), + location, + FormatVersion::V1, + properties, + ) + } + + /// Get the current schema with all changes applied up to this point. + #[inline] + pub fn current_schema(&self) -> &SchemaRef { + self.metadata.current_schema() + } + + /// Get the current last column id + #[inline] + pub fn last_column_id(&self) -> i32 { + self.metadata.last_column_id + } + + /// Get the current last updated timestamp + #[inline] + pub fn last_updated_ms(&self) -> i64 { + self.metadata.last_updated_ms + } + + /// Changes uuid of table metadata. + pub fn assign_uuid(mut self, uuid: Uuid) -> Self { + if self.metadata.table_uuid != uuid { + self.metadata.table_uuid = uuid; + self.changes.push(TableUpdate::AssignUuid { uuid }); + } + + self + } + + /// Upgrade `FormatVersion`. Downgrades are not allowed. + /// + /// # Errors + /// - Cannot downgrade to older format versions. + pub fn upgrade_format_version(mut self, format_version: FormatVersion) -> Result<Self> { + if format_version < self.metadata.format_version { + return Err(Error::new( + ErrorKind::DataInvalid, + format!( + "Cannot downgrade FormatVersion from {} to {}", + self.metadata.format_version, format_version + ), + )); + } + + if format_version != self.metadata.format_version { + self.metadata.format_version = format_version; + self.changes + .push(TableUpdate::UpgradeFormatVersion { format_version }); + } + + Ok(self) + } + + /// Set properties. If a property already exists, it will be overwritten. + /// + /// If a reserved property is set, the corresponding action is performed and the property is not persisted. + /// Currently the following reserved properties are supported: + /// * format-version: Set the format version of the table. + /// + /// # Errors + /// - If format-version property is set to a lower version than the current format version. + pub fn set_properties(mut self, properties: HashMap<String, String>) -> Result<Self> { + // List of specified properties that are RESERVED and should not be persisted. + let reserved_properties = properties + .keys() + .filter(|key| RESERVED_PROPERTIES.contains(&key.as_str())) + .map(ToString::to_string) + .collect::<Vec<_>>(); + + if !reserved_properties.is_empty() { + return Err(Error::new( + ErrorKind::DataInvalid, + format!( + "Table properties should not contain reserved properties, but got: [{}]", + reserved_properties.join(", ") + ), + )); + } + + if properties.is_empty() { + return Ok(self); + } + + self.metadata.properties.extend(properties.clone()); + self.changes.push(TableUpdate::SetProperties { + updates: properties, + }); + + Ok(self) + } + + /// Remove properties from the table metadata. + /// Does nothing if the key is not present. + pub fn remove_properties(mut self, properties: &[String]) -> Self { + for property in properties { + self.metadata.properties.remove(property); + } + + if !properties.is_empty() { + self.changes.push(TableUpdate::RemoveProperties { + removals: properties.to_vec(), + }); + } + + self + } + + /// Set the location of the table metadata, stripping any trailing slashes. + pub fn set_location(mut self, location: String) -> Self { + let location = location.trim_end_matches('/').to_string(); + if self.metadata.location != location { + self.changes.push(TableUpdate::SetLocation { + location: location.clone(), + }); + self.metadata.location = location; + } + + self + } + + /// Add a snapshot to the table metadata. + /// + /// # Errors + /// - No schema has been added to the table metadata. + /// - No partition spec has been added to the table metadata. + /// - No sort order has been added to the table metadata. + /// - Snapshot id already exists. + /// - For format version > 1: the sequence number of the snapshot is loser than the highest sequence number specified so far. + pub fn add_snapshot(mut self, snapshot: Snapshot) -> Result<Self> { + if self.metadata.partition_specs.is_empty() { + return Err(Error::new( + ErrorKind::DataInvalid, + "Attempting to add a snapshot before a partition spec is added", + )); + } + + if self.metadata.sort_orders.is_empty() { + return Err(Error::new( + ErrorKind::DataInvalid, + "Attempting to add a snapshot before a sort order is added", + )); + } + + if self + .metadata + .snapshots + .contains_key(&snapshot.snapshot_id()) + { + return Err(Error::new( + ErrorKind::DataInvalid, + format!("Snapshot already exists for: '{}'", snapshot.snapshot_id()), + )); + } + + if self.metadata.format_version != FormatVersion::V1 + && snapshot.sequence_number() <= self.metadata.last_sequence_number + && snapshot.parent_snapshot_id().is_some() + { + return Err(Error::new( + ErrorKind::DataInvalid, + format!( + "Cannot add snapshot with sequence number {} older than last sequence number {}", + snapshot.sequence_number(), + self.metadata.last_sequence_number + ) + )); + } + + if let Some(last) = self.metadata.snapshot_log.last() { + // commits can happen concurrently from different machines. + // A tolerance helps us avoid failure for small clock skew + if snapshot.timestamp_ms() - last.timestamp_ms < -ONE_MINUTE_MS { + return Err(Error::new( + ErrorKind::DataInvalid, + format!( + "Invalid snapshot timestamp {}: before last snapshot timestamp {}", + snapshot.timestamp_ms(), + last.timestamp_ms + ), + )); + } + } + + if snapshot.timestamp_ms() - self.metadata.last_updated_ms < -ONE_MINUTE_MS { + return Err(Error::new( + ErrorKind::DataInvalid, + format!( + "Invalid snapshot timestamp {}: before last updated timestamp {}", + snapshot.timestamp_ms(), + self.metadata.last_updated_ms + ), + )); + } + + // Mutation happens in next line - must be infallible from here + self.changes.push(TableUpdate::AddSnapshot { + snapshot: snapshot.clone(), + }); + + self.metadata.last_updated_ms = snapshot.timestamp_ms(); + self.metadata.last_sequence_number = snapshot.sequence_number(); + self.metadata + .snapshots + .insert(snapshot.snapshot_id(), snapshot.into()); + + Ok(self) + } + + /// Append a snapshot to the specified branch. + /// If branch is not specified, the snapshot is appended to the main branch. + /// The `ref` must already exist. Retention settings from the `ref` are re-used. + /// + /// # Errors + /// - The ref is unknown. + /// - Any of the preconditions of `self.add_snapshot` are not met. + pub fn append_snapshot(self, snapshot: Snapshot, ref_name: Option<&str>) -> Result<Self> { + let ref_name = ref_name.unwrap_or(MAIN_BRANCH); + let mut reference = self + .metadata + .refs + .get(ref_name) + .ok_or_else(|| { + Error::new( + ErrorKind::DataInvalid, + format!("Cannot append snapshot to unknown ref: '{}'", ref_name), + ) + })? + .clone(); + + reference.snapshot_id = snapshot.snapshot_id(); + + self.add_snapshot(snapshot)?.set_ref(ref_name, reference) + } + + /// Remove snapshots by its ids from the table metadata. + /// Does nothing if a snapshot id is not present. + /// Keeps as changes only the snapshots that were actually removed. + pub fn remove_snapshots(mut self, snapshot_ids: &[i64]) -> Self { + let mut removed_snapshots = Vec::with_capacity(snapshot_ids.len()); + + self.metadata.snapshots.retain(|k, _| { + if snapshot_ids.contains(k) { + removed_snapshots.push(*k); + false + } else { + true + } + }); + + if !removed_snapshots.is_empty() { + self.changes.push(TableUpdate::RemoveSnapshots { + snapshot_ids: removed_snapshots, + }); + } + + // Remove refs that are no longer valid + self.metadata + .refs + .retain(|_, v| self.metadata.snapshots.contains_key(&v.snapshot_id)); + + self + } + + /// Set a reference to a snapshot. + /// + /// # Errors + /// - The snapshot id is unknown. + pub fn set_ref(mut self, ref_name: &str, reference: SnapshotReference) -> Result<Self> { + if self + .metadata + .refs + .get(ref_name) + .is_some_and(|snap_ref| snap_ref.eq(&reference)) + { + return Ok(self); + } + + let Some(snapshot) = self.metadata.snapshots.get(&reference.snapshot_id) else { + return Err(Error::new( + ErrorKind::DataInvalid, + format!( + "Cannot set '{ref_name}' to unknown snapshot: '{}'", + reference.snapshot_id + ), + )); + }; + + // Update last_updated_ms to the exact timestamp of the snapshot if it was added in this commit + let is_added_snapshot = self.changes.iter().any(|update| { + matches!(update, TableUpdate::AddSnapshot { snapshot: snap } if snap.snapshot_id() == snapshot.snapshot_id()) + }); + if is_added_snapshot { + self.metadata.last_updated_ms = snapshot.timestamp_ms(); + } + + // Current snapshot id is set only for the main branch + if ref_name == MAIN_BRANCH { + self.metadata.current_snapshot_id = Some(snapshot.snapshot_id()); + if self.metadata.last_updated_ms == i64::default() { + self.metadata.last_updated_ms = chrono::Utc::now().timestamp_millis(); + }; + + self.metadata.snapshot_log.push(SnapshotLog { + snapshot_id: snapshot.snapshot_id(), + timestamp_ms: self.metadata.last_updated_ms, + }); + } + + self.changes.push(TableUpdate::SetSnapshotRef { + ref_name: ref_name.to_string(), + reference: reference.clone(), + }); + self.metadata.refs.insert(ref_name.to_string(), reference); + + Ok(self) + } + + /// Remove a reference + /// + /// If `ref_name='main'` the current snapshot id is set to -1. + pub fn remove_ref(mut self, ref_name: &str) -> Self { + if ref_name == MAIN_BRANCH { + self.metadata.current_snapshot_id = Some(i64::from(Self::LAST_ADDED)); + self.metadata.snapshot_log.clear(); + } + + if self.metadata.refs.remove(ref_name).is_some() || ref_name == MAIN_BRANCH { + self.changes.push(TableUpdate::RemoveSnapshotRef { + ref_name: ref_name.to_string(), + }); + } + + self + } + + /// Add a schema to the table metadata. + /// + /// The provided `schema.schema_id` may not be used. + + // ToDo Discuss: Should we add `new_last_column_id` argument? + // TLDR; I believe not as it acts as an assertion and its purpose (and source) is not clear. We shouldn't add it. + // + // Schemas can contain only old columns or a mix of old and new columns. + // In Java, if `new_last_column_id` set but too low, the function would fail, basically hinting at + // at the schema having been built for an older metadata version. `new_last_column_id` is typically obtained + // in the schema building process. + // + // This assertion is not required if the user controls the flow - he knows for which + // metadata he created a schema. If asserting the `new_last_column_id` was semantically important, it should be part of the schema and + // not be passed around alongside it. + // + // Specifying `new_last_column_id` in java also allows to set `metadata.last_column_id` to any arbitrary value + // even if its not present as a column. I believe this to be undesired behavior. This is not possible with the current Rust interface. + // + // If the schema is built out of sync with the TableMetadata, for example in a REST Catalog setting, the assertion of + // the provided `last_column_id` as part of the `TableUpdate::AddSchema` is still done in its `.apply` method. + pub fn add_schema(mut self, schema: Schema) -> Self { + // fn returns a result because I think we should check field-id <-> type compatibility if the field-id + // is still present in the metadata. This is not done in the Java code. + let new_schema_id = self.reuse_or_create_new_schema_id(&schema); + let schema_found = self.metadata.schemas.contains_key(&new_schema_id); + + if schema_found { + // ToDo Discuss: The Java code is a bit convoluted and I think it might be wrong for an edge case. + // Why is it wrong: The baseline is, that if something changes the state of the builder, it has an effect on it and + // must be recorded in the changes. + // The Java code might or might not change `lastAddedSchemaId`, and does not record this change in `changes`. + // Thus, replaying the changes, would lead to a different result if a schema is added twice in unfavorable + // conditions. + // Here we do it differently, but a check from a Java maintainer would be nice. + if self.last_added_schema_id != Some(new_schema_id) { + self.changes.push(TableUpdate::AddSchema { + last_column_id: Some(self.metadata.last_column_id), + schema: schema.clone(), + }); + self.last_added_schema_id = Some(new_schema_id); + } + + return self; + } + + // New schemas might contain only old columns. In this case last_column_id should not be + // reduced. + self.metadata.last_column_id = + std::cmp::max(self.metadata.last_column_id, schema.highest_field_id()); + + // Set schema-id + let schema = match new_schema_id == schema.schema_id() { + true => schema, + false => schema.with_schema_id(new_schema_id), + }; + + self.metadata + .schemas + .insert(new_schema_id, schema.clone().into()); + + self.changes.push(TableUpdate::AddSchema { + schema, + last_column_id: Some(self.metadata.last_column_id), + }); + + self.last_added_schema_id = Some(new_schema_id); + + self + } + + /// Set the current schema id. + /// + /// Errors: + /// - provided `schema_id` is -1 but no schema has been added via `add_schema`. + /// - No schema with the provided `schema_id` exists. + pub fn set_current_schema(mut self, mut schema_id: i32) -> Result<Self> { + if schema_id == Self::LAST_ADDED { + schema_id = self.last_added_schema_id.ok_or_else(|| { + Error::new( + ErrorKind::DataInvalid, + "Cannot set current schema to last added schema: no schema has been added.", + ) + })?; + }; + let schema_id = schema_id; // Make immutable + + if schema_id == self.metadata.current_schema_id { + return Ok(self); + } + + let _schema = self.metadata.schemas.get(&schema_id).ok_or_else(|| { + Error::new( + ErrorKind::DataInvalid, + format!( + "Cannot set current schema to unknown schema with id: '{}'", + schema_id + ), + ) + })?; + + // Old partition specs and sort-orders should be preserved even if they are not compatible with the new schema, + // so that older metadata can still be interpreted. + // Default partition spec and sort order are checked in the build() method + // which allows other default partition specs and sort orders to be set before the build. + + self.metadata.current_schema_id = schema_id; + + if self.last_added_schema_id == Some(schema_id) { + self.changes.push(TableUpdate::SetCurrentSchema { + schema_id: Self::LAST_ADDED, + }); + } else { + self.changes + .push(TableUpdate::SetCurrentSchema { schema_id }); + } + + Ok(self) + } + + /// Add a schema and set it as the current schema. + pub fn add_current_schema(self, schema: Schema) -> Result<Self> { + self.add_schema(schema).set_current_schema(Self::LAST_ADDED) + } + + /// Add a partition spec to the table metadata. + /// + /// The spec is bound eagerly to the current schema. + /// If a schema is added in the same set of changes, the schema should be added first. + /// + /// Even if `unbound_spec.spec_id` is provided as `Some`, it may not be used. + /// + /// # Errors + /// - The partition spec cannot be bound to the current schema. + /// - The partition spec has non-sequential field ids and the table format version is 1. + pub fn add_partition_spec(mut self, unbound_spec: UnboundPartitionSpec) -> Result<Self> { + let schema = self.get_current_schema()?.clone(); + let spec = PartitionSpecBuilder::new_from_unbound(unbound_spec.clone(), schema)? + .with_last_assigned_field_id(self.metadata.last_partition_id) + .build()?; + + let new_spec_id = self.reuse_or_create_new_spec_id(&spec); + let spec_found = self.metadata.partition_specs.contains_key(&new_spec_id); + let spec = spec.with_spec_id(new_spec_id); + let unbound_spec = unbound_spec.with_spec_id(new_spec_id); + + if spec_found { + if self.last_added_spec_id != Some(new_spec_id) { + self.changes + .push(TableUpdate::AddSpec { spec: unbound_spec }); + self.last_added_spec_id = Some(new_spec_id); + } + + return Ok(self); + } + + if self.metadata.format_version <= FormatVersion::V1 && !spec.has_sequential_ids() { + return Err(Error::new( + ErrorKind::DataInvalid, + "Cannot add partition spec with non-sequential field ids to format version 1 table", + )); + } + + let highest_field_id = spec + .highest_field_id() + .unwrap_or(UNPARTITIONED_LAST_ASSIGNED_ID); + self.metadata + .partition_specs + .insert(new_spec_id, Arc::new(spec.into())); + self.changes + .push(TableUpdate::AddSpec { spec: unbound_spec }); + + self.last_added_spec_id = Some(new_spec_id); + self.metadata.last_partition_id = + std::cmp::max(self.metadata.last_partition_id, highest_field_id); + + Ok(self) + } + + /// Set the default partition spec. + /// + /// # Errors + /// - spec_id is -1 but no spec has been added via `add_partition_spec`. + /// - No partition spec with the provided `spec_id` exists. + pub fn set_default_partition_spec(mut self, mut spec_id: i32) -> Result<Self> { + if spec_id == Self::LAST_ADDED { + spec_id = self.last_added_spec_id.ok_or_else(|| { + Error::new( + ErrorKind::DataInvalid, + "Cannot set default partition spec to last added spec: no spec has been added.", + ) + })?; + } + + if self.metadata.default_spec.spec_id() == spec_id { + return Ok(self); + } + + if !self.metadata.partition_specs.contains_key(&spec_id) { + return Err(Error::new( + ErrorKind::DataInvalid, + format!("Cannot set default partition spec to unknown spec with id: '{spec_id}'",), + )); + } + + let schemaless_spec = + self.metadata + .partition_specs + .get(&spec_id) + .ok_or_else(|| { + Error::new( + ErrorKind::DataInvalid, + format!("Cannot set default partition spec to unknown spec with id: '{spec_id}'",), + ) + })? + .clone(); + let spec = + Arc::unwrap_or_clone(schemaless_spec).bind(self.get_current_schema()?.clone())?; + self.metadata.default_spec = Arc::new(spec); + + if self.last_added_spec_id == Some(spec_id) { + self.changes.push(TableUpdate::SetDefaultSpec { + spec_id: Self::LAST_ADDED, + }); + } else { + self.changes.push(TableUpdate::SetDefaultSpec { spec_id }); + } + + Ok(self) + } + + /// Add a partition spec and set it as the default + pub fn add_default_partition_spec(self, unbound_spec: UnboundPartitionSpec) -> Result<Self> { + self.add_partition_spec(unbound_spec)? + .set_default_partition_spec(Self::LAST_ADDED) + } + + /// Add a sort order to the table metadata. + /// + /// The spec is bound eagerly to the current schema and must be valid for it. + /// If a schema is added in the same set of changes, the schema should be added first. + /// + /// Even if `sort_order.order_id` is provided, it may not be used. + /// + /// # Errors + /// - Sort order id to add already exists. + /// - Sort order is incompatible with the current schema. + pub fn add_sort_order(mut self, sort_order: SortOrder) -> Result<Self> { + let new_order_id = self.reuse_or_create_new_sort_id(&sort_order); + let sort_order_found = self.metadata.sort_orders.contains_key(&new_order_id); + + if sort_order_found { + if self.last_added_order_id != Some(new_order_id) { + self.changes.push(TableUpdate::AddSortOrder { + sort_order: sort_order.clone(), + }); + self.last_added_order_id = Some(new_order_id); + } + + return Ok(self); + } + + // ToDo Discuss: Java builds a fresh spec here: Review Comment: That is actually a very important point, and I think we should fix rust. Currently in rust we use the `SchemaBuilder` for everything. To get to it, we use an existing `Schema` and use the `into_builder(self)` method. I believe we should modify this to `into_builder(self, last_column_id: Option<i64>)` so that users are forced to think about the last_column_id. Most likely they will want to use the `last_column_id` of the metadata they got the `Schema` from. ########## crates/iceberg/src/spec/table_metadata_builder.rs: ########## @@ -0,0 +1,2074 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +use std::collections::{HashMap, HashSet}; +use std::sync::Arc; + +use uuid::Uuid; + +use super::{ + BoundPartitionSpec, FormatVersion, MetadataLog, PartitionSpecBuilder, Schema, SchemaRef, + Snapshot, SnapshotLog, SnapshotReference, SortOrder, SortOrderRef, TableMetadata, + UnboundPartitionSpec, DEFAULT_PARTITION_SPEC_ID, DEFAULT_SCHEMA_ID, MAIN_BRANCH, ONE_MINUTE_MS, + PROPERTY_METADATA_PREVIOUS_VERSIONS_MAX, PROPERTY_METADATA_PREVIOUS_VERSIONS_MAX_DEFAULT, + RESERVED_PROPERTIES, UNPARTITIONED_LAST_ASSIGNED_ID, +}; +use crate::error::{Error, ErrorKind, Result}; +use crate::{TableCreation, TableUpdate}; + +const FIRST_FIELD_ID: u32 = 1; + +/// Manipulating table metadata. +/// +/// For this builder the order of called functions matters. Functions are applied in-order. +/// All operations applied to the `TableMetadata` are tracked in `changes` as a chronologically +/// ordered vec of `TableUpdate`. +/// If an operation does not lead to a change of the `TableMetadata`, the corresponding update +/// is omitted from `changes`. +/// +/// Unlike a typical builder pattern, the order of function calls matters. +/// Some basic rules: +/// - `add_schema` must be called before `set_current_schema`. +/// - If a new partition spec and schema are added, the schema should be added first. +#[derive(Debug, Clone)] +pub struct TableMetadataBuilder { + metadata: TableMetadata, + changes: Vec<TableUpdate>, + last_added_schema_id: Option<i32>, + last_added_spec_id: Option<i32>, + last_added_order_id: Option<i64>, + // None if this is a new table (from_metadata) method not used + previous_history_entry: Option<MetadataLog>, +} + +#[derive(Debug, Clone, PartialEq)] +/// Result of modifying or creating a `TableMetadata`. +pub struct TableMetadataBuildResult { + /// The new `TableMetadata`. + pub metadata: TableMetadata, + /// The changes that were applied to the metadata. + pub changes: Vec<TableUpdate>, + /// Expired metadata logs + pub expired_metadata_logs: Vec<MetadataLog>, +} + +impl TableMetadataBuilder { + const LAST_ADDED: i32 = -1; + + /// Create a `TableMetadata` object from scratch. + /// + /// This method re-assign ids of fields in the schema, schema.id, sort_order.id and + /// spec.id. It should only be used to create new table metadata from scratch. + pub fn new( + schema: Schema, + spec: impl Into<UnboundPartitionSpec>, + sort_order: SortOrder, + location: String, + format_version: FormatVersion, + properties: HashMap<String, String>, + ) -> Result<Self> { + // Re-assign field_ids, schema.id, sort_order.id and spec.id for a new table. + let (fresh_schema, fresh_spec, fresh_sort_order) = + Self::reassign_ids(schema, spec.into(), sort_order)?; + let schema_id = fresh_schema.schema_id(); + + let builder = Self { + metadata: TableMetadata { + format_version, + table_uuid: Uuid::now_v7(), + location: "".to_string(), // Overwritten immediately by set_location + last_sequence_number: 0, + last_updated_ms: 0, // Overwritten by build() if not set before + last_column_id: -1, // Overwritten immediately by add_current_schema + current_schema_id: -1, // Overwritten immediately by add_current_schema + schemas: HashMap::new(), + partition_specs: HashMap::new(), + default_spec: Arc::new( + BoundPartitionSpec::unpartition_spec(fresh_schema.clone()).with_spec_id(-1), + ), // Overwritten immediately by add_default_partition_spec + last_partition_id: UNPARTITIONED_LAST_ASSIGNED_ID, + properties: HashMap::new(), + current_snapshot_id: None, + snapshots: HashMap::new(), + snapshot_log: vec![], + sort_orders: HashMap::new(), + metadata_log: vec![], + default_sort_order_id: -1, // Overwritten immediately by add_default_sort_order + refs: HashMap::default(), + }, + changes: vec![], + last_added_schema_id: Some(schema_id), + last_added_spec_id: None, + last_added_order_id: None, + previous_history_entry: None, + }; + + builder + .set_location(location) + .add_current_schema(fresh_schema)? + .add_default_partition_spec(fresh_spec.into_unbound())? + .add_default_sort_order(fresh_sort_order)? + .set_properties(properties) + } + + /// Creates a new table metadata builder from the given metadata to modify it. + + /// `current_file_location` is the location where the current version + /// of the metadata file is stored. This is used to update the metadata log. + /// If `current_file_location` is `None`, the metadata log will not be updated. + /// This should only be used to stage-create tables. + #[must_use] + pub fn new_from_metadata( + previous: TableMetadata, + previous_file_location: Option<String>, + ) -> Self { + Self { + previous_history_entry: previous_file_location.map(|l| MetadataLog { + metadata_file: l, + timestamp_ms: previous.last_updated_ms, + }), + metadata: previous, + changes: Vec::default(), + last_added_schema_id: None, + last_added_spec_id: None, + last_added_order_id: None, + } + } + + /// Creates a new table metadata builder from the given table creation. + pub fn from_table_creation(table_creation: TableCreation) -> Result<Self> { + let TableCreation { + name: _, + location, + schema, + partition_spec, + sort_order, + properties, + } = table_creation; + + let location = location.ok_or_else(|| { + Error::new( + ErrorKind::DataInvalid, + "Can't create table without location", + ) + })?; + let partition_spec = partition_spec.unwrap_or(UnboundPartitionSpec { + spec_id: None, + fields: vec![], + }); + + Self::new( + schema, + partition_spec, + sort_order.unwrap_or(SortOrder::unsorted_order()), + location, + FormatVersion::V1, + properties, + ) + } + + /// Get the current schema with all changes applied up to this point. + #[inline] + pub fn current_schema(&self) -> &SchemaRef { + self.metadata.current_schema() + } + + /// Get the current last column id + #[inline] + pub fn last_column_id(&self) -> i32 { + self.metadata.last_column_id + } + + /// Get the current last updated timestamp + #[inline] + pub fn last_updated_ms(&self) -> i64 { + self.metadata.last_updated_ms + } + + /// Changes uuid of table metadata. + pub fn assign_uuid(mut self, uuid: Uuid) -> Self { + if self.metadata.table_uuid != uuid { + self.metadata.table_uuid = uuid; + self.changes.push(TableUpdate::AssignUuid { uuid }); + } + + self + } + + /// Upgrade `FormatVersion`. Downgrades are not allowed. + /// + /// # Errors + /// - Cannot downgrade to older format versions. + pub fn upgrade_format_version(mut self, format_version: FormatVersion) -> Result<Self> { + if format_version < self.metadata.format_version { + return Err(Error::new( + ErrorKind::DataInvalid, + format!( + "Cannot downgrade FormatVersion from {} to {}", + self.metadata.format_version, format_version + ), + )); + } + + if format_version != self.metadata.format_version { + self.metadata.format_version = format_version; + self.changes + .push(TableUpdate::UpgradeFormatVersion { format_version }); + } + + Ok(self) + } + + /// Set properties. If a property already exists, it will be overwritten. + /// + /// If a reserved property is set, the corresponding action is performed and the property is not persisted. + /// Currently the following reserved properties are supported: + /// * format-version: Set the format version of the table. + /// + /// # Errors + /// - If format-version property is set to a lower version than the current format version. + pub fn set_properties(mut self, properties: HashMap<String, String>) -> Result<Self> { + // List of specified properties that are RESERVED and should not be persisted. + let reserved_properties = properties + .keys() + .filter(|key| RESERVED_PROPERTIES.contains(&key.as_str())) + .map(ToString::to_string) + .collect::<Vec<_>>(); + + if !reserved_properties.is_empty() { + return Err(Error::new( + ErrorKind::DataInvalid, + format!( + "Table properties should not contain reserved properties, but got: [{}]", + reserved_properties.join(", ") + ), + )); + } + + if properties.is_empty() { + return Ok(self); + } + + self.metadata.properties.extend(properties.clone()); + self.changes.push(TableUpdate::SetProperties { + updates: properties, + }); + + Ok(self) + } + + /// Remove properties from the table metadata. + /// Does nothing if the key is not present. + pub fn remove_properties(mut self, properties: &[String]) -> Self { + for property in properties { + self.metadata.properties.remove(property); + } + + if !properties.is_empty() { + self.changes.push(TableUpdate::RemoveProperties { + removals: properties.to_vec(), + }); + } + + self + } + + /// Set the location of the table metadata, stripping any trailing slashes. + pub fn set_location(mut self, location: String) -> Self { + let location = location.trim_end_matches('/').to_string(); + if self.metadata.location != location { + self.changes.push(TableUpdate::SetLocation { + location: location.clone(), + }); + self.metadata.location = location; + } + + self + } + + /// Add a snapshot to the table metadata. + /// + /// # Errors + /// - No schema has been added to the table metadata. + /// - No partition spec has been added to the table metadata. + /// - No sort order has been added to the table metadata. + /// - Snapshot id already exists. + /// - For format version > 1: the sequence number of the snapshot is loser than the highest sequence number specified so far. + pub fn add_snapshot(mut self, snapshot: Snapshot) -> Result<Self> { + if self.metadata.partition_specs.is_empty() { + return Err(Error::new( + ErrorKind::DataInvalid, + "Attempting to add a snapshot before a partition spec is added", + )); + } + + if self.metadata.sort_orders.is_empty() { + return Err(Error::new( + ErrorKind::DataInvalid, + "Attempting to add a snapshot before a sort order is added", + )); + } + + if self + .metadata + .snapshots + .contains_key(&snapshot.snapshot_id()) + { + return Err(Error::new( + ErrorKind::DataInvalid, + format!("Snapshot already exists for: '{}'", snapshot.snapshot_id()), + )); + } + + if self.metadata.format_version != FormatVersion::V1 + && snapshot.sequence_number() <= self.metadata.last_sequence_number + && snapshot.parent_snapshot_id().is_some() + { + return Err(Error::new( + ErrorKind::DataInvalid, + format!( + "Cannot add snapshot with sequence number {} older than last sequence number {}", + snapshot.sequence_number(), + self.metadata.last_sequence_number + ) + )); + } + + if let Some(last) = self.metadata.snapshot_log.last() { + // commits can happen concurrently from different machines. + // A tolerance helps us avoid failure for small clock skew + if snapshot.timestamp_ms() - last.timestamp_ms < -ONE_MINUTE_MS { + return Err(Error::new( + ErrorKind::DataInvalid, + format!( + "Invalid snapshot timestamp {}: before last snapshot timestamp {}", + snapshot.timestamp_ms(), + last.timestamp_ms + ), + )); + } + } + + if snapshot.timestamp_ms() - self.metadata.last_updated_ms < -ONE_MINUTE_MS { + return Err(Error::new( + ErrorKind::DataInvalid, + format!( + "Invalid snapshot timestamp {}: before last updated timestamp {}", + snapshot.timestamp_ms(), + self.metadata.last_updated_ms + ), + )); + } + + // Mutation happens in next line - must be infallible from here + self.changes.push(TableUpdate::AddSnapshot { + snapshot: snapshot.clone(), + }); + + self.metadata.last_updated_ms = snapshot.timestamp_ms(); + self.metadata.last_sequence_number = snapshot.sequence_number(); + self.metadata + .snapshots + .insert(snapshot.snapshot_id(), snapshot.into()); + + Ok(self) + } + + /// Append a snapshot to the specified branch. + /// If branch is not specified, the snapshot is appended to the main branch. + /// The `ref` must already exist. Retention settings from the `ref` are re-used. + /// + /// # Errors + /// - The ref is unknown. + /// - Any of the preconditions of `self.add_snapshot` are not met. + pub fn append_snapshot(self, snapshot: Snapshot, ref_name: Option<&str>) -> Result<Self> { + let ref_name = ref_name.unwrap_or(MAIN_BRANCH); + let mut reference = self + .metadata + .refs + .get(ref_name) + .ok_or_else(|| { + Error::new( + ErrorKind::DataInvalid, + format!("Cannot append snapshot to unknown ref: '{}'", ref_name), + ) + })? + .clone(); + + reference.snapshot_id = snapshot.snapshot_id(); + + self.add_snapshot(snapshot)?.set_ref(ref_name, reference) + } + + /// Remove snapshots by its ids from the table metadata. + /// Does nothing if a snapshot id is not present. + /// Keeps as changes only the snapshots that were actually removed. + pub fn remove_snapshots(mut self, snapshot_ids: &[i64]) -> Self { + let mut removed_snapshots = Vec::with_capacity(snapshot_ids.len()); + + self.metadata.snapshots.retain(|k, _| { + if snapshot_ids.contains(k) { + removed_snapshots.push(*k); + false + } else { + true + } + }); + + if !removed_snapshots.is_empty() { + self.changes.push(TableUpdate::RemoveSnapshots { + snapshot_ids: removed_snapshots, + }); + } + + // Remove refs that are no longer valid + self.metadata + .refs + .retain(|_, v| self.metadata.snapshots.contains_key(&v.snapshot_id)); + + self + } + + /// Set a reference to a snapshot. + /// + /// # Errors + /// - The snapshot id is unknown. + pub fn set_ref(mut self, ref_name: &str, reference: SnapshotReference) -> Result<Self> { + if self + .metadata + .refs + .get(ref_name) + .is_some_and(|snap_ref| snap_ref.eq(&reference)) + { + return Ok(self); + } + + let Some(snapshot) = self.metadata.snapshots.get(&reference.snapshot_id) else { + return Err(Error::new( + ErrorKind::DataInvalid, + format!( + "Cannot set '{ref_name}' to unknown snapshot: '{}'", + reference.snapshot_id + ), + )); + }; + + // Update last_updated_ms to the exact timestamp of the snapshot if it was added in this commit + let is_added_snapshot = self.changes.iter().any(|update| { + matches!(update, TableUpdate::AddSnapshot { snapshot: snap } if snap.snapshot_id() == snapshot.snapshot_id()) + }); + if is_added_snapshot { + self.metadata.last_updated_ms = snapshot.timestamp_ms(); + } + + // Current snapshot id is set only for the main branch + if ref_name == MAIN_BRANCH { + self.metadata.current_snapshot_id = Some(snapshot.snapshot_id()); + if self.metadata.last_updated_ms == i64::default() { + self.metadata.last_updated_ms = chrono::Utc::now().timestamp_millis(); + }; + + self.metadata.snapshot_log.push(SnapshotLog { + snapshot_id: snapshot.snapshot_id(), + timestamp_ms: self.metadata.last_updated_ms, + }); + } + + self.changes.push(TableUpdate::SetSnapshotRef { + ref_name: ref_name.to_string(), + reference: reference.clone(), + }); + self.metadata.refs.insert(ref_name.to_string(), reference); + + Ok(self) + } + + /// Remove a reference + /// + /// If `ref_name='main'` the current snapshot id is set to -1. + pub fn remove_ref(mut self, ref_name: &str) -> Self { + if ref_name == MAIN_BRANCH { + self.metadata.current_snapshot_id = Some(i64::from(Self::LAST_ADDED)); + self.metadata.snapshot_log.clear(); + } + + if self.metadata.refs.remove(ref_name).is_some() || ref_name == MAIN_BRANCH { + self.changes.push(TableUpdate::RemoveSnapshotRef { + ref_name: ref_name.to_string(), + }); + } + + self + } + + /// Add a schema to the table metadata. + /// + /// The provided `schema.schema_id` may not be used. + + // ToDo Discuss: Should we add `new_last_column_id` argument? + // TLDR; I believe not as it acts as an assertion and its purpose (and source) is not clear. We shouldn't add it. + // + // Schemas can contain only old columns or a mix of old and new columns. + // In Java, if `new_last_column_id` set but too low, the function would fail, basically hinting at + // at the schema having been built for an older metadata version. `new_last_column_id` is typically obtained + // in the schema building process. + // + // This assertion is not required if the user controls the flow - he knows for which + // metadata he created a schema. If asserting the `new_last_column_id` was semantically important, it should be part of the schema and + // not be passed around alongside it. + // + // Specifying `new_last_column_id` in java also allows to set `metadata.last_column_id` to any arbitrary value + // even if its not present as a column. I believe this to be undesired behavior. This is not possible with the current Rust interface. + // + // If the schema is built out of sync with the TableMetadata, for example in a REST Catalog setting, the assertion of + // the provided `last_column_id` as part of the `TableUpdate::AddSchema` is still done in its `.apply` method. + pub fn add_schema(mut self, schema: Schema) -> Self { + // fn returns a result because I think we should check field-id <-> type compatibility if the field-id + // is still present in the metadata. This is not done in the Java code. + let new_schema_id = self.reuse_or_create_new_schema_id(&schema); + let schema_found = self.metadata.schemas.contains_key(&new_schema_id); + + if schema_found { + // ToDo Discuss: The Java code is a bit convoluted and I think it might be wrong for an edge case. + // Why is it wrong: The baseline is, that if something changes the state of the builder, it has an effect on it and + // must be recorded in the changes. + // The Java code might or might not change `lastAddedSchemaId`, and does not record this change in `changes`. + // Thus, replaying the changes, would lead to a different result if a schema is added twice in unfavorable + // conditions. + // Here we do it differently, but a check from a Java maintainer would be nice. + if self.last_added_schema_id != Some(new_schema_id) { + self.changes.push(TableUpdate::AddSchema { + last_column_id: Some(self.metadata.last_column_id), + schema: schema.clone(), + }); + self.last_added_schema_id = Some(new_schema_id); + } + + return self; + } + + // New schemas might contain only old columns. In this case last_column_id should not be + // reduced. + self.metadata.last_column_id = + std::cmp::max(self.metadata.last_column_id, schema.highest_field_id()); + + // Set schema-id + let schema = match new_schema_id == schema.schema_id() { + true => schema, + false => schema.with_schema_id(new_schema_id), + }; + + self.metadata + .schemas + .insert(new_schema_id, schema.clone().into()); + + self.changes.push(TableUpdate::AddSchema { + schema, + last_column_id: Some(self.metadata.last_column_id), + }); + + self.last_added_schema_id = Some(new_schema_id); + + self + } + + /// Set the current schema id. + /// + /// Errors: + /// - provided `schema_id` is -1 but no schema has been added via `add_schema`. + /// - No schema with the provided `schema_id` exists. + pub fn set_current_schema(mut self, mut schema_id: i32) -> Result<Self> { + if schema_id == Self::LAST_ADDED { + schema_id = self.last_added_schema_id.ok_or_else(|| { + Error::new( + ErrorKind::DataInvalid, + "Cannot set current schema to last added schema: no schema has been added.", + ) + })?; + }; + let schema_id = schema_id; // Make immutable + + if schema_id == self.metadata.current_schema_id { + return Ok(self); + } + + let _schema = self.metadata.schemas.get(&schema_id).ok_or_else(|| { + Error::new( + ErrorKind::DataInvalid, + format!( + "Cannot set current schema to unknown schema with id: '{}'", + schema_id + ), + ) + })?; + + // Old partition specs and sort-orders should be preserved even if they are not compatible with the new schema, + // so that older metadata can still be interpreted. + // Default partition spec and sort order are checked in the build() method + // which allows other default partition specs and sort orders to be set before the build. + + self.metadata.current_schema_id = schema_id; + + if self.last_added_schema_id == Some(schema_id) { + self.changes.push(TableUpdate::SetCurrentSchema { + schema_id: Self::LAST_ADDED, + }); + } else { + self.changes + .push(TableUpdate::SetCurrentSchema { schema_id }); + } + + Ok(self) + } + + /// Add a schema and set it as the current schema. + pub fn add_current_schema(self, schema: Schema) -> Result<Self> { + self.add_schema(schema).set_current_schema(Self::LAST_ADDED) + } + + /// Add a partition spec to the table metadata. + /// + /// The spec is bound eagerly to the current schema. + /// If a schema is added in the same set of changes, the schema should be added first. + /// + /// Even if `unbound_spec.spec_id` is provided as `Some`, it may not be used. + /// + /// # Errors + /// - The partition spec cannot be bound to the current schema. + /// - The partition spec has non-sequential field ids and the table format version is 1. + pub fn add_partition_spec(mut self, unbound_spec: UnboundPartitionSpec) -> Result<Self> { + let schema = self.get_current_schema()?.clone(); + let spec = PartitionSpecBuilder::new_from_unbound(unbound_spec.clone(), schema)? + .with_last_assigned_field_id(self.metadata.last_partition_id) + .build()?; + + let new_spec_id = self.reuse_or_create_new_spec_id(&spec); + let spec_found = self.metadata.partition_specs.contains_key(&new_spec_id); + let spec = spec.with_spec_id(new_spec_id); + let unbound_spec = unbound_spec.with_spec_id(new_spec_id); + + if spec_found { + if self.last_added_spec_id != Some(new_spec_id) { + self.changes + .push(TableUpdate::AddSpec { spec: unbound_spec }); + self.last_added_spec_id = Some(new_spec_id); + } + + return Ok(self); + } + + if self.metadata.format_version <= FormatVersion::V1 && !spec.has_sequential_ids() { + return Err(Error::new( + ErrorKind::DataInvalid, + "Cannot add partition spec with non-sequential field ids to format version 1 table", + )); + } + + let highest_field_id = spec + .highest_field_id() + .unwrap_or(UNPARTITIONED_LAST_ASSIGNED_ID); + self.metadata + .partition_specs + .insert(new_spec_id, Arc::new(spec.into())); + self.changes + .push(TableUpdate::AddSpec { spec: unbound_spec }); + + self.last_added_spec_id = Some(new_spec_id); + self.metadata.last_partition_id = + std::cmp::max(self.metadata.last_partition_id, highest_field_id); + + Ok(self) + } + + /// Set the default partition spec. + /// + /// # Errors + /// - spec_id is -1 but no spec has been added via `add_partition_spec`. + /// - No partition spec with the provided `spec_id` exists. + pub fn set_default_partition_spec(mut self, mut spec_id: i32) -> Result<Self> { + if spec_id == Self::LAST_ADDED { + spec_id = self.last_added_spec_id.ok_or_else(|| { + Error::new( + ErrorKind::DataInvalid, + "Cannot set default partition spec to last added spec: no spec has been added.", + ) + })?; + } + + if self.metadata.default_spec.spec_id() == spec_id { + return Ok(self); + } + + if !self.metadata.partition_specs.contains_key(&spec_id) { + return Err(Error::new( + ErrorKind::DataInvalid, + format!("Cannot set default partition spec to unknown spec with id: '{spec_id}'",), + )); + } + + let schemaless_spec = + self.metadata + .partition_specs + .get(&spec_id) + .ok_or_else(|| { + Error::new( + ErrorKind::DataInvalid, + format!("Cannot set default partition spec to unknown spec with id: '{spec_id}'",), + ) + })? + .clone(); + let spec = + Arc::unwrap_or_clone(schemaless_spec).bind(self.get_current_schema()?.clone())?; + self.metadata.default_spec = Arc::new(spec); + + if self.last_added_spec_id == Some(spec_id) { + self.changes.push(TableUpdate::SetDefaultSpec { + spec_id: Self::LAST_ADDED, + }); + } else { + self.changes.push(TableUpdate::SetDefaultSpec { spec_id }); + } + + Ok(self) + } + + /// Add a partition spec and set it as the default + pub fn add_default_partition_spec(self, unbound_spec: UnboundPartitionSpec) -> Result<Self> { + self.add_partition_spec(unbound_spec)? + .set_default_partition_spec(Self::LAST_ADDED) + } + + /// Add a sort order to the table metadata. + /// + /// The spec is bound eagerly to the current schema and must be valid for it. + /// If a schema is added in the same set of changes, the schema should be added first. + /// + /// Even if `sort_order.order_id` is provided, it may not be used. + /// + /// # Errors + /// - Sort order id to add already exists. + /// - Sort order is incompatible with the current schema. + pub fn add_sort_order(mut self, sort_order: SortOrder) -> Result<Self> { + let new_order_id = self.reuse_or_create_new_sort_id(&sort_order); + let sort_order_found = self.metadata.sort_orders.contains_key(&new_order_id); + + if sort_order_found { + if self.last_added_order_id != Some(new_order_id) { + self.changes.push(TableUpdate::AddSortOrder { + sort_order: sort_order.clone(), + }); + self.last_added_order_id = Some(new_order_id); + } + + return Ok(self); + } + + // ToDo Discuss: Java builds a fresh spec here: Review Comment: CC @liurenjie1024 -- This is an automated message from the Apache Git Service. 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