feat: support COPY ... TO STDOUT (FORMAT parquet|json)

[fanyang01]

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Copilot reviewed 6 out of 7 changed files in this pull request and generated 3 suggestions.

Files not reviewed (1)

• pgtest/psql/copy/parquet.sql: Language not supported

Comments skipped due to low confidence (5)

pgserver/copy.go:21

• The regular expression might not handle multiple spaces or newlines correctly. Consider using \s+ to match any whitespace characters.

reCopyToFormat = regexp.MustCompile(`(?i)^COPY\s+(.*?)\s+TO\s+STDOUT(?:\s+(?:WITH\s*)?\(\s*(?:FORMAT\s+(\w+)\s*,?\s*)?(.*?)\s*\))?$`)

pgserver/copy.go:25

• Ensure the RemoveComments function is robust enough to handle all edge cases, as it plays a crucial role in cleaning up the input before parsing.

stmt = RemoveComments(stmt)

pgserver/copy.go:12

• Verify that the CopyFormat constants are correctly defined and used throughout the code. Incrementing from tree.CopyFormatCSV might cause issues if the enum values are not contiguous.

CopyFormatParquet = tree.CopyFormatCSV + 1

pgserver/stmt.go:113

• Verify the correctness of the nested block comment handling in the RemoveLeadingComments function.

// Skip block comment with nesting support

pgserver/datawriter.go:124

• Redundant closing parenthesis for the FORMAT CSV case. It should be removed.

builder.WriteString(")")

[VWagen1989]

Excellent work! LGTM