public final SkewSpecContext skewSpec() throws RecognitionException {
		SkewSpecContext _localctx = new SkewSpecContext(_ctx, getState());
		enterRule(_localctx, 12, RULE_skewSpec);
		try {
			enterOuterAlt(_localctx, 1);
			{
			setState(286);
			match(SKEWED);
			setState(287);
			match(BY);
			setState(288);
			identifierList();
			setState(289);
			match(ON);
			setState(292);
			_errHandler.sync(this);
			switch ( getInterpreter().adaptivePredict(_input,12,_ctx) ) {
			case 1:
				{
				setState(290);
				constantList();
				}
				break;
			case 2:
				{
				setState(291);
				nestedConstantList();
				}
				break;
			}
			setState(297);
			_errHandler.sync(this);
			switch ( getInterpreter().adaptivePredict(_input,13,_ctx) ) {
			case 1:
				{
				setState(294);
				match(STORED);
				setState(295);
				match(AS);
				setState(296);
				match(DIRECTORIES);
				}
				break;
			}
			}
		}
		catch (RecognitionException re) {
			_localctx.exception = re;
			_errHandler.reportError(this, re);
			_errHandler.recover(this, re);
		}
		finally {
			exitRule();
		}
		return _localctx;
	}
When true, the behavior of keywords follows ANSI SQL standard.
amoro-format-mixed/amoro-mixed-spark/v3.5/amoro-mixed-spark-3.5/src/main/gen-antlr/org/apache/amoro/spark/sql/parser/MixedFormatSqlExtendParser.java