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https://issues.apache.org/jira/browse/FLINK-15570?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Caizhi Weng updated FLINK-15570:
--------------------------------
Priority: Major (was: Minor)
> Support inserting into non-empty csv tables
> -------------------------------------------
>
> Key: FLINK-15570
> URL: https://issues.apache.org/jira/browse/FLINK-15570
> Project: Flink
> Issue Type: Improvement
> Components: Connectors / FileSystem, Formats (JSON, Avro, Parquet,
> ORC, SequenceFile)
> Reporter: Caizhi Weng
> Priority: Major
> Labels: Usability
>
> Currently we only support inserting into empty csv tables. It would be nice
> for a new user, especially for users from traditional database, to try out
> Flink if we support inserting into non-empty csv tables.
> In other words, it would be nice if the following SQL produces a valid result:
> {code:java}
> CREATE TABLE myTable(
> a INT,
> b DOUBLE
> ) WITH (
> 'connector.type' = 'filesystem',
> 'connector.path' = an existing csv file,
> 'format.type' = 'csv',
> 'format.derive-schema' = 'true'
> );
> SELECT * FROM myTable; // produces 3 rows
> INSERT INTO myTable VALUES (4, 4.4);
> SELECT * FROM myTable; // produces 4 rows{code}
> We currently only have two write modes, namely NO_OVERWRITE and OVERWRITE. In
> NO_OVERWRITE mode we can only insert into empty csv tables, while in
> OVERWRITE mode inserting into a csv table will wipe all existing data in it
> (in the above example, the last SELECT will produce only 1 instead of 4 rows)
> which is really strange for a mere INSERT operation.
> We need to add a new APPEND write mode, or change the behavior for OVERWRITE
> mode to something like appending to files. Supporting specifying write mode
> in the WITH clause is also needed.
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