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Code Issues Releases Wiki Activity

improved sql parser, support over winding_clause.

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This commit is contained in:
wenshao
2016-10-09 10:02:44 +08:00
parent 93cfb5ba58
commit 57bf786427
6 changed files with 436 additions and 25 deletions
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src/main/java/com/alibaba/druid/sql/parser/SQLExprParser.java
+51
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@@ -1078,6 +1078,57 @@ public class SQLExprParser extends SQLParser {
over.setOf(of);
}
SQLOver.WindowingType windowingType = null;
if (identifierEquals("ROWS")) {
windowingType = SQLOver.WindowingType.ROWS;
} else if (identifierEquals("RANGE")) {
windowingType = SQLOver.WindowingType.RANGE;
}
if (windowingType != null) {
over.setWindowingType(windowingType);
lexer.nextToken();
if (lexer.token == Token.BETWEEN) {
lexer.nextToken();
SQLIntegerExpr rowsBegin = (SQLIntegerExpr) this.primary();
over.setWindowingBetweenBegin(rowsBegin);
if (identifierEquals("PRECEDING")) {
over.setWindowingBetweenBeginPreceding(true);
lexer.nextToken();
} else if (identifierEquals("FOLLOWING")) {
over.setWindowingBetweenBeginFollowing(true);
lexer.nextToken();
}
accept(Token.AND);
SQLIntegerExpr betweenEnd = (SQLIntegerExpr) this.primary();
over.setWindowingBetweenEnd(betweenEnd);
if (identifierEquals("PRECEDING")) {
over.setWindowingBetweenEndPreceding(true);
lexer.nextToken();
} else if (identifierEquals("FOLLOWING")) {
over.setWindowingBetweenEndFollowing(true);
lexer.nextToken();
}
} else {
SQLIntegerExpr rowsExpr = (SQLIntegerExpr) this.primary();
over.setWindowing(rowsExpr);
if (identifierEquals("PRECEDING")) {
over.setWindowingPreceding(true);
lexer.nextToken();
} else if (identifierEquals("FOLLOWING")) {
over.setWindowingFollowing(true);
lexer.nextToken();
}
}
}
accept(Token.RPAREN);
aggregateExpr.setOver(over);
}