sadikovi opened a new pull request, #36726:
URL: https://github.com/apache/spark/pull/36726
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### What changes were proposed in this pull request?
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This PR adds support for TimestampNTZ (TIMESTAMP WITHOUT TIME ZONE) in JDBC
data source. It also introduces a new configuration option
`inferTimestampNTZType` which allows to read written timestamps as timestamp
without time zone. By default this is set to `false`, i.e. all timestamps are
read as legacy timestamp type.
Here is the state of timestamp without time zone support in the built-in
dialects:
- H2: timestamp without time zone, seems to map to timestamp type
- Derby: only has timestamp type
- MySQL: only has timestamp type
- Postgres: has timestamp without time zone, which maps to timestamp
- SQL Server: only datetime/datetime2, neither are time zone aware
- Oracle: seems to only have timestamp and timestamp with time zone
- Teradata: similar to Oracle but I could not verify
- DB2: has TIMESTAMP WITHOUT TIME ZONE but I could not make this type work
in my test, only TIMESTAMP seems to work
### Why are the changes needed?
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Adds support for the new TimestampNTZ type, see
https://issues.apache.org/jira/browse/SPARK-35662.
### Does this PR introduce _any_ user-facing change?
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JDBC data source is now capable of writing and reading TimestampNTZ types.
When reading timestamp values, configuration option `inferTimestampNTZType`
allows to infer those values as TIMESTAMP WITHOUT TIME ZONE. By default the
option is set to `false` so the behaviour is unchanged and all timestamps are
read TIMESTAMP WITH LOCAL TIME ZONE.
### How was this patch tested?
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I added a unit test to ensure the general functionality works. I also
manually verified the write/read test for TimestampNTZ in the following
databases (all I could get access to):
- H2, `jdbc:h2:mem:testdb0`
- Derby, `jdbc:derby:<filepath>`
- MySQL, `docker run --name mysql -e MYSQL_ROOT_PASSWORD=secret -e
MYSQL_DATABASE=db -e MYSQL_USER=user -e MYSQL_PASSWORD=secret -p 3306:3306 -d
mysql:5.7`, `jdbc:mysql://127.0.0.1:3306/db?user=user&password=secret`
- PostgreSQL, `docker run -d --name postgres -e POSTGRES_PASSWORD=secret -e
POSTGRES_USER=user -e POSTGRES_DB=db -p 5432:5432 postgres:12.11`,
`jdbc:postgresql://127.0.0.1:5432/db?user=user&password=secret`
- SQL Server, `docker run -e "ACCEPT_EULA=Y" -e
SA_PASSWORD='yourStrong(!)Password' -p 1433:1433 -d
mcr.microsoft.com/mssql/server:2019-CU15-ubuntu-20.04`,
`jdbc:sqlserver://127.0.0.1:1433;user=sa;password=yourStrong(!)Password`
- DB2, ` docker run -itd --name mydb2 --privileged=true -p 50000:50000 -e
LICENSE=accept -e DB2INST1_PASSWORD=secret -e DBNAME=db ibmcom/db2`,
`jdbc:db2://127.0.0.1:50000/db:user=db2inst1;password=secret;`.
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