yaooqinn opened a new pull request #29834:
URL: https://github.com/apache/spark/pull/29834
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### What changes were proposed in this pull request?
This PR makes the empty string for schema name pattern match the global temp
view as same as it works for other databases.
This PR also add new tests to covering different kinds of wildcards to
verify the SparkGetSchemasOperation
### Why are the changes needed?
When the schema name is empty string, it is considered as ".*" and can match
all databases in the catalog.
But when it can not match the global temp view as it is not converted to ".*"
### Does this PR introduce _any_ user-facing change?
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yes , JDBC operation like
`statement.getConnection.getMetaData..getSchemas(null, "")` now also provides
the global temp view in the result set.
### How was this patch tested?
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new tests
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