mattmartin14 commented on code in PR #1534:
URL: https://github.com/apache/iceberg-python/pull/1534#discussion_r1941309081


##########
pyproject.toml:
##########
@@ -842,6 +851,5026 @@ ignore_missing_imports = true
 module = "daft.*"
 ignore_missing_imports = true
 
+[[tool.mypy.overrides]]
+module = "pyiceberg_core.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "pyparsing.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "pyspark.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "strictyaml.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "sortedcontainers.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "sqlalchemy.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "Cython.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "setuptools.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "tenacity.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "pyarrow.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "pandas.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "snappy.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "zstandard.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "pydantic.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "pydantic_core.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "pytest.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "fastavro.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "mmh3.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "hive_metastore.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "thrift.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "requests_mock.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "click.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "rich.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "fsspec.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "s3fs.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "azure.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "adlfs.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "gcsfs.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "packaging.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "tests.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "boto3"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "botocore.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "mypy_boto3_glue.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "moto"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "aiobotocore.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "aiohttp.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "duckdb.*"

Review Comment:
   I'm not sure what to tell you on this; my org has a strict way of accessing 
our internal python package repo; i was able to finally get poetry to work with 
it and ran the lock file. Not sure if this is harming anything or not



##########
tests/table/test_merge_rows.py:
##########
@@ -0,0 +1,397 @@
+# 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.
+
+from pyiceberg.catalog.sql import SqlCatalog
+import os
+import shutil
+
+_TEST_NAMESPACE = "test_ns"
+
+try:
+    from datafusion import SessionContext
+except ModuleNotFoundError as e:
+    raise ModuleNotFoundError("For merge_rows, DataFusion needs to be 
installed") from e
+
+def get_test_warehouse_path():
+    curr_dir = os.path.dirname(os.path.abspath(__file__))
+    return f"{curr_dir}/warehouse"
+
+def get_sql_catalog(namespace: str) -> SqlCatalog:
+    warehouse_path = get_test_warehouse_path()
+    catalog = SqlCatalog(
+        "default",
+        **{
+            "uri": f"sqlite:///:memory:",
+            "warehouse": f"file://{warehouse_path}",
+        },
+    )
+
+    catalog.create_namespace(namespace=namespace)
+    return catalog
+
+def purge_warehouse():
+    warehouse_path = get_test_warehouse_path()
+
+    if os.path.exists(warehouse_path):
+        shutil.rmtree(warehouse_path)
+
+def show_iceberg_table(table, ctx: SessionContext):
+    import pyarrow.dataset as ds
+    table_name = "target"
+    if ctx.table_exist(table_name):
+        ctx.deregister_table(table_name)
+    ctx.register_dataset(table_name, ds.dataset(table.scan().to_arrow()))
+    ctx.sql(f"SELECT * FROM {table_name} limit 5").show()
+
+def show_df(df, ctx: SessionContext):
+    import pyarrow.dataset as ds
+    ctx.register_dataset("df", ds.dataset(df))
+    ctx.sql("select * from df limit 10").show()
+
+def gen_source_dataset(start_row: int, end_row: int, composite_key: bool, 
add_dup: bool, ctx: SessionContext):
+
+    additional_columns = ", t.order_id + 1000 as order_line_id" if 
composite_key else ""
+
+    dup_row = f"""
+        UNION ALL
+        (
+        SELECT t.order_id {additional_columns}
+            , date '2021-01-01' as order_date, 'B' as order_type
+        from t
+        limit 1
+        )
+    """ if add_dup else ""
+
+
+    sql = f"""
+        with t as (SELECT unnest(range({start_row},{end_row+1})) as order_id)
+        SELECT t.order_id {additional_columns}
+            , date '2021-01-01' as order_date, 'B' as order_type
+        from t
+        {dup_row}
+    """
+
+    #print(sql)
+
+    df = ctx.sql(sql).to_arrow_table()
+
+
+    return df
+
+def gen_target_iceberg_table(start_row: int, end_row: int, composite_key: 
bool, ctx: SessionContext):
+
+    additional_columns = ", t.order_id + 1000 as order_line_id" if 
composite_key else ""
+
+    df = ctx.sql(f"""
+        with t as (SELECT unnest(range({start_row},{end_row+1})) as order_id)
+        SELECT t.order_id {additional_columns}
+            , date '2021-01-01' as order_date, 'A' as order_type
+        from t
+    """).to_arrow_table()
+
+    catalog = get_sql_catalog(_TEST_NAMESPACE)
+    table = catalog.create_table(f"{_TEST_NAMESPACE}.target", df.schema)
+
+    table.append(df)
+
+    return table
+
+def test_merge_scenario_1a_simple():
+
+    """
+        tests a single insert and update
+    """
+
+    ctx = SessionContext()
+
+    table = gen_target_iceberg_table(1, 2, False, ctx)
+    source_df = gen_source_dataset(2, 3, False, False, ctx)
+
+    res = table.merge_rows(df=source_df, join_cols=["order_id"])
+
+    rows_updated_should_be = 1
+    rows_inserted_should_be = 1
+
+    assert res['rows_updated'] == rows_updated_should_be, f"rows updated 
should be {rows_updated_should_be}, but got {res['rows_updated']}"
+    assert res['rows_inserted'] == rows_inserted_should_be, f"rows inserted 
should be {rows_inserted_should_be}, but got {res['rows_inserted']}"
+
+    purge_warehouse()
+    print('merge rows: test scenario 1a pass')
+
+def test_merge_scenario_1b_simple():
+
+    """
+        tests a single insert and update; skips a row that does not need to be 
updated
+    """
+
+    ctx = SessionContext()
+
+    df = ctx.sql(f"""
+        select 1 as order_id, date '2021-01-01' as order_date, 'A' as 
order_type
+        union all
+        select 2 as order_id, date '2021-01-01' as order_date, 'A' as 
order_type
+    """).to_arrow_table()
+
+    catalog = get_sql_catalog(_TEST_NAMESPACE)
+    table = catalog.create_table(f"{_TEST_NAMESPACE}.target", df.schema)
+
+    table.append(df)
+
+    source_df = ctx.sql(f"""
+        select 1 as order_id, date '2021-01-01' as order_date, 'A' as 
order_type
+        union all
+        select 2 as order_id, date '2021-01-01' as order_date, 'B' as 
order_type  
+        union all 
+        select 3 as order_id, date '2021-01-01' as order_date, 'A' as 
order_type
+    """).to_arrow_table()
+
+    res = table.merge_rows(df=source_df, join_cols=["order_id"])
+
+    rows_updated_should_be = 1
+    rows_inserted_should_be = 1
+
+    assert res['rows_updated'] == rows_updated_should_be, f"rows updated 
should be {rows_updated_should_be}, but got {res['rows_updated']}"
+    assert res['rows_inserted'] == rows_inserted_should_be, f"rows inserted 
should be {rows_inserted_should_be}, but got {res['rows_inserted']}"
+
+    purge_warehouse()
+    print('merge rows: test scenario 1b (skip 1 row) pass')
+
+
+def test_merge_scenario_1c_simple():
+
+    """
+        tests a single insert and update; primary key is a date column
+    """
+
+    ctx = SessionContext()
+
+    df = ctx.sql(f"""
+        select date '2021-01-01' as order_date, 'A' as order_type
+        union all
+        select date '2021-01-02' as order_date, 'A' as order_type
+    """).to_arrow_table()
+
+    catalog = get_sql_catalog(_TEST_NAMESPACE)
+    table = catalog.create_table(f"{_TEST_NAMESPACE}.target", df.schema)
+
+    table.append(df)
+
+    source_df = ctx.sql(f"""
+        select date '2021-01-01' as order_date, 'A' as order_type
+        union all
+        select date '2021-01-02' as order_date, 'B' as order_type  
+        union all 
+        select date '2021-01-03' as order_date, 'A' as order_type
+    """).to_arrow_table()
+
+    res = table.merge_rows(df=source_df, join_cols=["order_date"])
+
+    rows_updated_should_be = 1
+    rows_inserted_should_be = 1
+
+    assert res['rows_updated'] == rows_updated_should_be, f"rows updated 
should be {rows_updated_should_be}, but got {res['rows_updated']}"
+    assert res['rows_inserted'] == rows_inserted_should_be, f"rows inserted 
should be {rows_inserted_should_be}, but got {res['rows_inserted']}"
+
+    purge_warehouse()
+    print('merge rows: test scenario 1c (date as key column) pass')
+
+def test_merge_scenario_1d_simple():
+
+    """
+        tests a single insert and update; primary key is a string column
+    """
+
+    ctx = SessionContext()
+
+    df = ctx.sql(f"""
+        select 'abc' as order_id, 'A' as order_type
+        union all
+        select 'def' as order_id, 'A' as order_type
+    """).to_arrow_table()
+
+    catalog = get_sql_catalog(_TEST_NAMESPACE)
+    table = catalog.create_table(f"{_TEST_NAMESPACE}.target", df.schema)
+
+    table.append(df)
+
+    source_df = ctx.sql(f"""
+        select 'abc' as order_id, 'A' as order_type
+        union all
+        select 'def' as order_id, 'B' as order_type  
+        union all 
+        select 'ghi' as order_id, 'A' as order_type
+    """).to_arrow_table()
+
+    res = table.merge_rows(df=source_df, join_cols=["order_id"])
+
+    rows_updated_should_be = 1
+    rows_inserted_should_be = 1
+
+    assert res['rows_updated'] == rows_updated_should_be, f"rows updated 
should be {rows_updated_should_be}, but got {res['rows_updated']}"
+    assert res['rows_inserted'] == rows_inserted_should_be, f"rows inserted 
should be {rows_inserted_should_be}, but got {res['rows_inserted']}"
+
+    purge_warehouse()
+    print('merge rows: test scenario 1d (string as key column) pass')
+
+def test_merge_scenario_2_10k_rows():
+
+    """
+        tests merging 10000 rows on a single key to simulate larger workload
+    """
+
+    ctx = SessionContext()
+
+    table = gen_target_iceberg_table(1, 10000, False, ctx)
+    source_df = gen_source_dataset(5001, 15000, False, False, ctx)
+    
+
+    res = table.merge_rows(df=source_df, join_cols=["order_id"])
+
+    rows_updated_should_be = 5000
+    rows_inserted_should_be = 5000
+
+    assert res['rows_updated'] == rows_updated_should_be, f"rows updated 
should be {rows_updated_should_be}, but got {res['rows_updated']}"
+    assert res['rows_inserted'] == rows_inserted_should_be, f"rows inserted 
should be {rows_inserted_should_be}, but got {res['rows_inserted']}"
+
+    purge_warehouse()
+    print('merge rows: test scenario 2 pass')
+
+def test_merge_scenario_3_composite_key():
+
+    """
+        tests merging 200 rows with a composite key
+    """
+
+    ctx = SessionContext()
+
+    table = gen_target_iceberg_table(1, 200, True, ctx)
+    source_df = gen_source_dataset(101, 300, True, False, ctx)
+    
+
+    res = table.merge_rows(df=source_df, join_cols=["order_id", 
"order_line_id"])
+
+    rows_updated_should_be = 100
+    rows_inserted_should_be = 100
+
+    assert res['rows_updated'] == rows_updated_should_be, f"rows updated 
should be {rows_updated_should_be}, but got {res['rows_updated']}"
+    assert res['rows_inserted'] == rows_inserted_should_be, f"rows inserted 
should be {rows_inserted_should_be}, but got {res['rows_inserted']}"
+
+    purge_warehouse()
+    print('merge rows: composite keys test pass')
+
+def test_merge_update_only():
+    
+    """
+        tests explicit merge options to do update only
+    """
+
+    ctx = SessionContext()
+
+    table = gen_target_iceberg_table(1, 1000, False, ctx)
+    source_df = gen_source_dataset(501, 1500, False, False, ctx)
+    
+    res = table.merge_rows(df=source_df, join_cols=["order_id"], 
when_matched_update_all=True, when_not_matched_insert_all=False)
+
+    rows_updated_should_be = 500
+    rows_inserted_should_be = 0
+
+    assert res['rows_updated'] == rows_updated_should_be, f"rows updated 
should be {rows_updated_should_be}, but got {res['rows_updated']}"
+    assert res['rows_inserted'] == rows_inserted_should_be, f"rows inserted 
should be {rows_inserted_should_be}, but got {res['rows_inserted']}"
+
+    purge_warehouse()
+    print('merge rows: update only pass')
+
+def test_merge_insert_only():
+    """
+        tests explicit merge options to do insert only
+    """
+
+    ctx = SessionContext()
+
+    table = gen_target_iceberg_table(1, 1000, False, ctx)
+    source_df = gen_source_dataset(501, 1500, False, False, ctx)
+    
+    res = table.merge_rows(df=source_df, join_cols=["order_id"], 
when_matched_update_all=False, when_not_matched_insert_all=True)
+
+    rows_updated_should_be = 0
+    rows_inserted_should_be = 500
+
+    assert res['rows_updated'] == rows_updated_should_be, f"rows updated 
should be {rows_updated_should_be}, but got {res['rows_updated']}"
+    assert res['rows_inserted'] == rows_inserted_should_be, f"rows inserted 
should be {rows_inserted_should_be}, but got {res['rows_inserted']}"
+
+    purge_warehouse()
+    print('merge rows: insert only pass')
+
+def test_merge_source_dups():
+
+    """
+        tests duplicate rows in source
+    """
+
+    ctx = SessionContext()
+
+    table = gen_target_iceberg_table(1, 10, False, ctx)
+    source_df = gen_source_dataset(5, 15, False, True, ctx)
+    
+    res = table.merge_rows(df=source_df, join_cols=["order_id"])
+
+    error_msgs = res['error_msgs']
+
+    assert 'Duplicate rows found in source dataset' in error_msgs, f"error 
message should contain 'Duplicate rows found in source dataset', but got 
{error_msgs}"
+
+    purge_warehouse()
+    print('merge rows: source dups test pass')
+
+def test_key_cols_misaligned():
+
+    """
+        tests join columns missing from one of the tables
+    """
+
+    ctx = SessionContext()
+
+    #generate dummy target iceberg table
+    df = ctx.sql("select 1 as order_id, date '2021-01-01' as order_date, 'A' 
as order_type").to_arrow_table()
+
+    catalog = get_sql_catalog(_TEST_NAMESPACE)
+    table = catalog.create_table(f"{_TEST_NAMESPACE}.target", df.schema)
+
+    table.append(df)
+
+    df_src = ctx.sql("select 1 as item_id, date '2021-05-01' as order_date, 
'B' as order_type").to_arrow_table()
+
+    res = table.merge_rows(df=df_src, join_cols=['order_id'])
+    error_msgs = res['error_msgs']
+
+    assert 'Join columns missing in tables' in error_msgs, f"error message 
should contain 'Join columns missing in tables', but got {error_msgs}"
+
+    purge_warehouse()
+
+    print('merge rows: key cols misaligned test pass')
+
+if __name__ == "__main__":

Review Comment:
   removed if __name__ == "__main__"



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