[minleejae]

parseExpression and parseCondExpression duplicated the simple/complex parsing attempts. Keep one fallback path in parseExpression, delegate conditional expression parsing to it, and extract a private overload for a single configured attempt.

The first attempt still requires the complete input. A retry creates a fresh parser, reapplies the configuration callback, and honors the caller's partial-parsing setting. Public signatures and reported exception behavior are preserved.

Validation:

• Fourteen characterization cases pass before and after the refactor, covering both APIs, partial input, configuration callbacks, fresh retry parsers, null/empty input, and exception messages and causes.
• Maven verify on JDK 21: 11,879 tests, 25 skipped, zero failures or errors.
• Gradle check on JDK 17: 11,897 tests, 25 skipped, zero failures or errors; grammar ambiguity, formatting, Checkstyle, PMD, SpotBugs, and coverage checks pass. The local Spotless baseline was set to upstream/master with an init script because this checkout uses a fork remote.
• Public CCJSqlParserUtil signatures match the baseline, and the grammar is unchanged.

AI assistance: prepared with Codex.