[SPARK-3536][SQL] SELECT on empty parquet table throws exception

[ravipesala]

It returns null metadata from parquet if querying on empty parquet file while calculating splits.So added null check and returns the empty splits.

Author : ravipesala ravindra.pesala@huawei.com

[ravipesala]

Please review

[SparkQA]

Can one of the admins verify this patch?

[marmbrus]

ok to test

[ravipesala]

Though @marmbrus called "ok to test" 3 days ago, QA is not merging it and not running the test cases. Did I miss something here?

[marmbrus]

Sometimes Jenkins is flakey. I just requested a test though a back channel. Please ping me again if it doesn't fire shortly.

[SparkQA]

QA tests have started for PR 2456 at commit 1e81a50.

• This patch merges cleanly.

[SparkQA]

QA tests have finished for PR 2456 at commit 1e81a50.

• This patch passes unit tests.
• This patch merges cleanly.
• This patch adds the following public classes (experimental):
  • logInfo("Interrupting user class to stop.")

[marmbrus]

Thanks! Merged to master.