julianhyde commented on a change in pull request #1112: [CALCITE-2930]
FilterCorrelateRule on a Correlate with SemiJoinType SEMI (or ANTI) throws
IllegalStateException (Ruben Quesada Lopez)
URL: https://github.com/apache/calcite/pull/1112#discussion_r270673350
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File path: core/src/main/java/org/apache/calcite/plan/RelOptUtil.java
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@@ -2380,6 +2381,8 @@ public static boolean classifyFilters(
joinRel.getInputs().get(1).getRowType().getFieldList();
final int nFieldsRight = rightFields.size();
assert nTotalFields == (joinRel instanceof SemiJoin
Review comment:
I think the assert is really useful. It tells the maintainer of the code
what they are dealing with.
It's ugly because we have a mess to clean up. Leave it until we've cleaned
up the mess.
If we wanted an invariant, then we'd use `Objects` or `Preconditions`
methods that, unlike `assert`, do not disappear, and we'd add them to the
constructor.
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