kgyrtkirk commented on code in PR #3279:
URL: https://github.com/apache/calcite/pull/3279#discussion_r1241723952
##########
core/src/main/java/org/apache/calcite/plan/RelOptPredicateList.java:
##########
@@ -236,14 +236,18 @@ public boolean isEffectivelyNotNull(RexNode e) {
}
}
if (SqlKind.COMPARISON.contains(e.getKind())) {
- // A comparison with a (non-null) literal, such as 'ref < 10', is not
null if 'ref'
- // is not null.
+ // A comparison with a (non-null) literal, such as 'ref < 10', or '10 <
ref',
+ // is not null if 'ref' is not null.
List<RexNode> operands = ((RexCall) e).getOperands();
// We can have just one operand in case e.g. of a RexSubQuery with IN
operator.
if (operands.size() > 1 && operands.get(1) instanceof RexLiteral
&& !((RexLiteral) operands.get(1)).isNull()) {
return isEffectivelyNotNull(operands.get(0));
}
+ if (operands.size() > 1 && operands.get(0) instanceof RexLiteral
+ && !((RexLiteral) operands.get(0)).isNull()) {
+ return isEffectivelyNotNull(operands.get(1));
+ }
Review Comment:
I wonder if it would make sense to instead of this:
* push those `RexLiteral` related stuff as part of `isEffectivelyNotNull`
somewhere at the beginning
* replace this block with something like:
```
for(int i=0;i<operands.size();i++) {
if(!isEffectivelyNotNull(operands.get(0)) {
return false;
}
}
return true;
```
so that it will handle `x > y is not true` ; in case `x` and `y` is known to
be not null
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