wuyunfeng commented on a change in pull request #3597:
URL: https://github.com/apache/incubator-doris/pull/3597#discussion_r425539095
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File path: fe/src/main/java/org/apache/doris/analysis/SelectStmt.java
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@@ -618,16 +618,33 @@ private Expr processDuplicateOrs(List<List<Expr>> exprs) {
temp.add(makeCompound(cloneExprs, CompoundPredicate.Operator.AND));
}
+ Expr result;
+ boolean isReturnCommonFactorExpr = false;
for (List<Expr> exprList : clearExprs) {
exprList.removeAll(cloneExprs);
+ if (exprList.size() == 0) {
+ // For example, the sql is "where (a = 1) or (a = 1 and B = 2)"
+ // if "(a = 1)" is extracted as a common factor expression,
then the first expression "(a = 1)" has no expression
+ // other than a common factor expression, and the second
expression "(a = 1 and B = 2)" has an expression of "(B = 2)"
+ //
+ // In this case, the common factor expression ("a = 1") can be
directly used to replace the whole CompoundOrPredicate.
+ // In Fact, the common factor expression is actually the
parent set of expression "(a = 1)" and expression "(a = 1 and B = 2)"
+ //
+ // exprList.size() == 0 means one child of CompoundOrPredicate
has no expression other than a common factor expression.
+ isReturnCommonFactorExpr = true;
+ break;
+ }
temp.add(makeCompound(exprList, CompoundPredicate.Operator.AND));
}
-
- // rebuild CompoundPredicate if found duplicate predicate will build
（predcate) and (.. or ..) predicate in
- // step 1: will build (.. or ..)
- Expr result = CollectionUtils.isNotEmpty(cloneExprs) ? new
CompoundPredicate(CompoundPredicate.Operator.AND,
- temp.get(0), makeCompound(temp.subList(1, temp.size()),
CompoundPredicate.Operator.OR))
- : makeCompound(temp, CompoundPredicate.Operator.OR);
+ if (isReturnCommonFactorExpr) {
+ result = temp.get(0);
+ } else {
+ // rebuild CompoundPredicate if found duplicate predicate will
build （predcate) and (.. or ..) predicate in
+ // step 1: will build (.. or ..)
+ result = CollectionUtils.isNotEmpty(cloneExprs) ? new
CompoundPredicate(CompoundPredicate.Operator.AND,
+ temp.get(0), makeCompound(temp.subList(1, temp.size()),
CompoundPredicate.Operator.OR))
+ : makeCompound(temp, CompoundPredicate.Operator.OR);
+ }
LOG.debug("rewrite ors: " + result.toSql());
Review comment:
```suggestion
if (LOG.isDebugEnabled) {
LOG.debug("rewrite ors: " + result.toSql());
}
```
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