julianhyde commented on a change in pull request #2141:
URL: https://github.com/apache/calcite/pull/2141#discussion_r485832224
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File path: core/src/main/java/org/apache/calcite/rex/RexCall.java
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@@ -80,7 +80,6 @@ protected RexCall(
this.nodeCount = RexUtil.nodeCount(1, this.operands);
assert op.getKind() != null : op;
assert op.validRexOperands(operands.size(), Litmus.THROW) : this;
- assert op.kind != SqlKind.IN || this instanceof RexSubQuery;
Review comment:
> having the possibly to define an IN list call in relational algebra
(even though Calcite core does not do it) is something useful that should not
be forbidden.
I agree. This feature is precisely that facility.
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