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Errors

pg_hint_plan stops hint parsing on any error and will uses the hints already parsed. Here are some typical errors.

Syntax errors

Any syntactical errors or wrong hint names are reported as a syntax error. These errors are reported in the server log with the message level specified by pg_hint_plan.message_level if pg_hint_plan.debug_print is on and above.

Incorrect Object definitions

Incorrect object definitions result in silently ignoring the hints. This kind of error is reported as a "Not Used Hint" in the server logs.

Redundant or conflicting hints

The last hint is considered when redundant hints are defined or hints conflict with each other. This kind of error is reported as a duplicated hints.

Nested comments

Hint comments cannot be recursive. If detected, hint parsing is immediately stopped and all the hints already parsed are ignored.