[pgpool-hackers: 3351] Import PostgreSQL12 Parser

[Bo Peng]

Hi all,

The attached patch imports PostgreSQL12 beta2 parser to Pgpool-II 4.1.

Major chanegs of PostgreSQL11 parser include:

- Add new VACUUM options:
  -- SKIP_LOCKED
  -- INDEX_CLEANUP
  -- TRUNCATE

- Add COMMIT AND CHAIN and ROLLBACK AND CHAIN commands

- Add a WHERE clause to COPY FROM

- Allow to use CREATE OR REPLACE AGGREGATE command

- Allow to use mcv (most-common-value) in CREATE STATISTICS

- ADD REINDEX option CONCURRENTLY 

- Add EXPLAIN option SETTINGS

- etc.

-- 
Bo Peng <pengbo at sraoss.co.jp>
SRA OSS, Inc. Japan
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