AngersZhuuuu opened a new pull request #31257:
URL: https://github.com/apache/spark/pull/31257
### What changes were proposed in this pull request?
Support `SHOW TABLES` command as a table valued function.
So user can be easy to reach metadata system information use SQL and
analysis directory.
### Why are the changes needed?
user can be easy to reach metadata system information use SQL and analysis
directory.
### Does this PR introduce _any_ user-facing change?
Yea, user can get table list by call table valued function `show_table()`
```
sql("CREATE DATABASE d1")
sql("CREATE TABLE t1(a INT) USING PARQUET")
sql("CREATE TABLE d1.t1(a INT) USING PARQUET")
sql("CREATE TABLE d1.t2(a INT) USING PARQUET")
sql("SELECT * from show_tables()")
sql("SELECT * from show_tables('default')")
sql("SELECT * from show_tables('d1')")
sql("SELECT * from show_tables('d1', 't1*')")
```
### How was this patch tested?
Added UT
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