[SPARK-29255][SQL][TESTS] Rename package pgSQL to postgreSQL

[gengliangwang]

What changes were proposed in this pull request?

Rename the package pgSQL to postgreSQL

Why are the changes needed?

To address the comment in #25697 (comment) . The official full name seems more reasonable.

Does this PR introduce any user-facing change?

No.

How was this patch tested?

Existing unit tests.

[maropu]

Looks ok to me. also cc: @dongjoon-hyun@HyukjinKwon

[SparkQA]

Test build #111397 has finished for PR 25936 at commit fbffe34.

• This patch fails due to an unknown error code, -9.
• This patch merges cleanly.
• This patch adds no public classes.

[gengliangwang]

retest this please.

[dongjoon-hyun]

@gengliangwang . Could you handle the followings together?

$ git grep pgSQL
sql/core/src/test/resources/sql-tests/inputs/udf/postgreSQL/udf-aggregates_part1.sql:-- This test file was converted from pgSQL/aggregates_part1.sql.
sql/core/src/test/resources/sql-tests/inputs/udf/postgreSQL/udf-aggregates_part2.sql:-- This test file was converted from pgSQL/aggregates_part2.sql.
sql/core/src/test/resources/sql-tests/inputs/udf/postgreSQL/udf-aggregates_part3.sql:-- This test file was converted from pgSQL/aggregates_part3.sql.
sql/core/src/test/resources/sql-tests/inputs/udf/postgreSQL/udf-aggregates_part4.sql:-- This test file was converted from pgSQL/aggregates_part4.sql.
sql/core/src/test/resources/sql-tests/inputs/udf/postgreSQL/udf-case.sql:-- This test file was converted from pgSQL/case.sql.
sql/core/src/test/resources/sql-tests/inputs/udf/postgreSQL/udf-join.sql:-- This test file was converted from pgSQL/join.sql.
sql/core/src/test/resources/sql-tests/inputs/udf/postgreSQL/udf-select_having.sql:-- This test file was converted from inputs/pgSQL/select_having.sql
sql/core/src/test/resources/sql-tests/inputs/udf/postgreSQL/udf-select_implicit.sql:-- This test file was converted from pgSQL/select_implicit.sql

[dongjoon-hyun]

+1, LGTM except only the above minor request (changing the path in sql script comment consistently).

[HyukjinKwon]

LGTM too except @dongjoon-hyun's comments

[gengliangwang]

@dongjoon-hyun Thanks for the suggestion.
The output of git grep pgSQL is now empty.

[SparkQA]

Test build #111399 has finished for PR 25936 at commit fbffe34.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Test build #111412 has finished for PR 25936 at commit 18be34f.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[wangyum]

Merged to master.

[dongjoon-hyun]

Thank you all!

[maropu]

Thanks, @gengliangwang !