AfterShip / clickhouse-sql-parser / 23149151169

Pull #258

github

fix: support expressions (dotted column refs) in DISTINCT ON

parseDistinctOn() was calling parseIdent() which only handles simple
identifiers. Queries like DISTINCT ON (t.id, t.name) would fail because
the dot was not recognized. Changed to parseExpr() so that any valid
column expression (including table.column references) is accepted.

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