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Flink Jira Bot updated FLINK-12557:
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Labels: auto-deprioritized-major stale-minor (was:
auto-deprioritized-major)
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> Improve the DDL property keys to be more concise and readble
> ------------------------------------------------------------
>
> Key: FLINK-12557
> URL: https://issues.apache.org/jira/browse/FLINK-12557
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / API
> Reporter: Danny Chen
> Priority: Minor
> Labels: auto-deprioritized-major, stale-minor
>
> The *with* option in table DDL defines the properties needed for specific
> connector to create TableSource/Sink. The properties structure for SqlClient
> config YAML is defined in [Improvements to the Unified SQL Connector
> API|https://docs.google.com/document/d/1Yaxp1UJUFW-peGLt8EIidwKIZEWrrA-pznWLuvaH39Y/edit#heading=h.41fd6rs7b3cf],
> in this design, the properties can be categorized into 4 parts:
>
> # Top level properties: name, type(source, sink), update-mode ...
> # Connector specific properties: connector.type, connector.path ...
> # Format properties: format.type, format.fields.1.name ...
> # Table schema properties: (can be omitted for DDL)
>
> This properties structure is reasonable for YAML, but they are not that
> concise enough for developers. So there also defines a tool class named
> [DescriptorProperties|https://github.com/apache/flink/blob/b3604f7bee7456b8533e9ea222a833a2624e36c2/flink-table/flink-table-common/src/main/java/org/apache/flink/table/descriptors/DescriptorProperties.java#L67]
> to reconstruct the data structure(like TableSchema) from the flat k-v
> strings.
>
> So in order to reduce complexity and keep the KV consistency for DDL with
> properties and TableFactory properties, i proposed to simplify the DDL with
> properties keys as following (corresponding to above 4 categories):
>
> # Top level properties: keep same as that in the YAML e.g. connector,
> update-mode
> # Connector specific properties: start with prefix named the connector type
> e.g. for kafka connector, the properties are defined as kafka.k1 = v1,
> kafka.k2 = v2
> # Format properties: format.type simplified to format and the others with
> prefix of the format name e.g. format = 'json', json.line-delimiter = "\n"
> # Table schema properties: omitted.
> Here is a demo of creat table DDL:
> {code:java}
> CREATE TABLE Kafka10SourceTable (
> intField INTEGER,
> stringField VARCHAR(128) COMMENT 'User IP address',
> longField BIGINT,
> rowTimeField TIMESTAMP,
> WATERMARK wm01 FOR 'longField' AS BOUNDED WITH DELAY '60' SECOND
> )
> COMMENT 'Kafka Source Table of topic user_ip_address'
> WITH (
> connector='kafka',
> kafka.property-version='1',
> kafka.version='0.10',
> kafka.topic='test-kafka-topic',
> kafka.startup-mode = 'latest-offset'
> kafka.specific-offset = 'offset'
> format='json'
> json.property-version = '1'
> json.version='1'
> json.derive-schema='true'
> )
> {code}
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