Add REFRESH keyword to KEYWORDS dictionary

[RamiNoodle733]

Summary

Adds the REFRESH keyword to the KEYWORDS dictionary to enable proper recognition of SQL statements like REFRESH MATERIALIZED VIEW.

Changes

• Added 'REFRESH': tokens.Keyword to KEYWORDS dictionary in sqlparse/keywords.py

Testing

import sqlparse
sql = 'REFRESH MATERIALIZED VIEW my_view'
parsed = sqlparse.parse(sql)[0]
first_token = parsed.token_first(skip_cm=True)
assert first_token.ttype in sqlparse.tokens.Keyword  # Passes

Fixes #797

[Copilot]

Pull request overview

This PR attempts to add support for the REFRESH keyword to enable proper recognition of SQL statements like REFRESH MATERIALIZED VIEW, addressing issue #797 where such queries were being detected as 'UNKNOWN' type.

Changes:

• Adds 'REFRESH': tokens.Keyword to the KEYWORDS dictionary in sqlparse/keywords.py

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[Copilot]

The REFRESH keyword is placed after REPEATABLE, but alphabetically REFRESH should come before REPEATABLE. The keyword should be inserted between RENAME and REPEATABLE to maintain alphabetical order in the KEYWORDS dictionary.

Suggested change

	'REPEATABLE': tokens.Keyword,
	'REFRESH': tokens.Keyword,
	'REFRESH': tokens.Keyword,
	'REPEATABLE': tokens.Keyword,

[Copilot]

The REFRESH keyword is being added to the wrong dictionary with the wrong token type. REFRESH MATERIALIZED VIEW is a Data Definition Language (DDL) operation similar to CREATE, ALTER, DROP, and TRUNCATE. It should be added to the KEYWORDS_COMMON dictionary (around line 684-687) as 'REFRESH': tokens.Keyword.DDL instead of being added to the main KEYWORDS dictionary. With the current implementation, the get_type() method will return 'UNKNOWN' for REFRESH statements, which doesn't address the issue described in #797 where the user expects the query type to be properly detected.

Suggested change

	'REFRESH': tokens.Keyword,
	'REFRESH': tokens.Keyword.DDL,

[Copilot]

This PR adds a new keyword but does not include test coverage. Based on the test patterns in the codebase (e.g., tests/test_grouping.py:411-419 for get_type(), tests/test_regressions.py:345-356 for keyword verification), a test should be added to verify that REFRESH is properly recognized as a DDL keyword and that statements like 'REFRESH MATERIALIZED VIEW my_view' have get_type() return 'REFRESH' instead of 'UNKNOWN'.