Youngwb edited a comment on issue #3930:
URL:
https://github.com/apache/incubator-doris/issues/3930#issuecomment-654853902
According to @morningman @yangzhg 's suggest, I made some corrections
## name
use `sequence` column instead of `version` column for user understand easy.
## Create table
Use UNIQUE_KEYS instead of AGG_KEYS. Because sequence column is a hidden
column, there is no need to create a `version` column with MAX AGG_TYPE.
```
CREATE TABLE `test_1` (
`pin_id` bigint(20) NOT NULL COMMENT "",
`date` date NOT NULL COMMENT "",
`group_id` bigint(20) NOT NULL COMMENT "",
`keyword` varchar(128) NOT NULL
) ENGINE=OLAP
UNIQUE KEY(`pin_id`, `date`, `group_id`)
PROPERTIES (
"function_column.sequence_type" = "int"
);
```
like such example, user need to add `sequence_type` to Identify the sequence
column type. It only support the Integer types (int, bigint, largeint) and
time types(date, datetime). User can't query the `sequence_column` hidden in
table , but can add one column which value is equal to `sequence_column`.
like this
```
CREATE TABLE `test_2` (
`pin_id` bigint(20) NOT NULL COMMENT "",
`date` date NOT NULL COMMENT "",
`group_id` bigint(20) NOT NULL COMMENT "",
`sequence_visiable` int NOT NULL,
`keyword` varchar(128) NOT NULL
) ENGINE=OLAP
UNIQUE KEY(`pin_id`, `date`, `group_id`)
PROPERTIES (
"function_column.sequence_type" = "int"
);
```
Column names are not necessarily "sequence_visiable", this is just an
example. The user ensures that the values are same by specifying parameters at
LOAD time
## LOAD
### Stream Load
`curl --location-trusted -u root -H "columns:
pin_id,date,group_id,source_sequence,keyword" -H
"function_column.sequence_col: source_sequence" -T test_load
http://127.0.01:8030/api/test/test_1/_stream_load`
### Broker Load
```
LOAD LABEL test.test11
(
DATA INFILE("hdfs://path/to/load_file")
INTO TABLE `test_1`
FORMAT AS "parquet"
(pin_id,date,group_id,source_sequence,keyword)
ORDER BY source_sequence
) with BROKER broker_name (...)
```
### Routine Load
```
CREATE ROUTINE LOAD test_1_job ON test_1
COLUMNS TERMINATED BY ",",
(pin_id,date,group_id,source_sequence,keyword)
ORDER BY source_sequence
PROPERTIES
(
"desired_concurrent_number"="3",
"max_batch_interval" = "30",
"max_batch_rows" = "1000000",
"max_batch_size" = "509715200"
) FROM KAFKA
(
"kafka_broker_list" = "...",
"kafka_topic" = "...",
"property.client.id" = "...",
"property.group.id" = "..."
);
```
I added a parameter `sequence_col` to identify the source data for the
sequence column at load, because it's hidden column, user need to identify the
source column in `columns_mapping`.
For table `test_2` which has column `sequence_visiable`, user can set
"sequence_col" = "sequence_visiable" at properties, which means the hidden
column "sequence_col" is same with the "sequence_visiable" in table, user can
query the the column "sequence_visiable" instead of "sequence_col"
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