gianm commented on code in PR #15974:
URL: https://github.com/apache/druid/pull/15974#discussion_r1509516323
##########
processing/src/main/java/org/apache/druid/math/expr/Function.java:
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@@ -3803,16 +3854,56 @@ public ExpressionType
getOutputType(Expr.InputBindingInspector inspector, List<E
}
@Override
- ExprEval doApply(ExprEval lhsExpr, ExprEval rhsExpr)
+ public ExprEval apply(List<Expr> args, Expr.ObjectBinding bindings)
{
- final Object[] array1 = lhsExpr.asArray();
- final List<Object> array2 = Arrays.asList(rhsExpr.asArray());
+ final ExprEval arrayExpr1 = args.get(0).eval(bindings);
+ final ExprEval arrayExpr2 = args.get(1).eval(bindings);
+
+ final Object[] array1 = arrayExpr1.asArray();
+ final Object[] array2 = arrayExpr2.asArray();
+ if (array1 == null) {
+ return ExprEval.ofLong(null);
Review Comment:
This makes me wonder what happens when the rhs array includes null.
Consider `MV_CONTAINS(x, ARRAY[NULL, 'abc', 'def'])`, when `x` is a MVD
where one row contains a single `NULL`. Is that equivalent to `x IS NULL OR
MV_CONTAINS(x, ARRAY['abc', 'def'])` (which returns `TRUE`) or is it equivalent
to `MV_CONTAINS(x, ARRAY['abc', 'def'])`?
For that matter, consider `MV_CONTAINS(x, ARRAY['abc', 'def'])` in the same
situation. Does it return `FALSE` as if `x` was treated like `ARRAY[NULL]` (a
nonnull array containing null)? Or does it return `UNKNOWN` as if `x` was
`NULL` itself?
Do the answers to these questions depend on how the `MV_CONTAINS` is
planned— whether it ends up as an `array_contains` or a filter or something
else?
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