liyuheng55555 commented on code in PR #9438:
URL: https://github.com/apache/iotdb/pull/9438#discussion_r1155512516
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server/src/main/java/org/apache/iotdb/db/mpp/plan/parser/ASTVisitor.java:
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@@ -2430,6 +2437,58 @@ private Expression parseRoundFunction(
return functionExpression;
}
+ private CaseWhenThenExpression parseCaseWhenThenExpression(
+ IoTDBSqlParser.CaseWhenThenExpressionContext context, boolean
canUseFullPath) {
+ if (context.caseWhenThenExpression1() != null) {
+ return parseCaseWhenThenExpression1(context.caseWhenThenExpression1(),
canUseFullPath);
+ }
+
+ if (context.caseWhenThenExpression2() != null) {
+ return parseCaseWhenThenExpression2(context.caseWhenThenExpression2(),
canUseFullPath);
+ }
+
+ throw new UnsupportedOperationException();
+ }
+
+ private CaseWhenThenExpression parseCaseWhenThenExpression1(
+ IoTDBSqlParser.CaseWhenThenExpression1Context context, boolean
canUseFullPath) {
+ List<WhenThenExpression> whenThenList = new ArrayList<>();
+ for (IoTDBSqlParser.WhenThenExpressionContext whenThenExpressionContext :
+ context.whenThenExpression()) {
+ whenThenList.add(parseWhenThenExpression(whenThenExpressionContext,
canUseFullPath));
+ }
+ Expression elseExpression = new NullOperand();
+ if (context.elseExpression != null) {
+ elseExpression = parseExpression(context.elseExpression, canUseFullPath);
+ }
+ return new CaseWhenThenExpression(whenThenList, elseExpression);
+ }
+
+ private CaseWhenThenExpression parseCaseWhenThenExpression2(
+ IoTDBSqlParser.CaseWhenThenExpression2Context context, boolean
canUseFullPath) {
+ Expression caseExpression = parseExpression(context.caseExpression,
canUseFullPath);
+ List<WhenThenExpression> whenThenList = new ArrayList<>();
+ for (IoTDBSqlParser.WhenThenExpressionContext whenThenExpressionContext :
+ context.whenThenExpression()) {
+ Expression when =
parseExpression(whenThenExpressionContext.whenExpression, canUseFullPath);
+ Expression then =
parseExpression(whenThenExpressionContext.thenExpression, canUseFullPath);
+ Expression comparison = new EqualToExpression(caseExpression, when);
+ whenThenList.add(new WhenThenExpression(comparison, then));
+ }
+ Expression elseExpression = new NullOperand();
+ if (context.elseExpression != null) {
+ elseExpression = parseExpression(context.elseExpression, canUseFullPath);
+ }
+ return new CaseWhenThenExpression(whenThenList, elseExpression);
+ }
Review Comment:
done.
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