Peng-Lei opened a new pull request #34666:
URL: https://github.com/apache/spark/pull/34666
### What changes were proposed in this pull request?
1. Migrate `SHOW TBLPROPERTIES` to use V2 command by default
2. Sort the result of V1 command of `SHOW TBLPROPERTIES`
3. handle the `output == 1` case for V2 command to match V1 behavior
### Why are the changes needed?
It's been a while since we introduced the v2 commands, and it seems
reasonable to use v2 commands by default even for the session catalog, with a
legacy config to fall back to the v1 commands.
### Does this PR introduce _any_ user-facing change?
For use V2 command:
if LEGACY_KEEP_COMMAND_OUTPUT_SCHEMA == true
change output `Row("key", "value")` => `Row("value")`
At now it is not supported for view that `SHOW TBLPROPERTIES` command by
default.
we can set `LEGACY_USE_V1_COMMAND` to use V1 command.
### How was this patch tested?
$ build/sbt -Phive-2.3 -Phive-thriftserver "test:testOnly
*ShowTblPropertiesSuite"
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