zoov-w commented on code in PR #4452:
URL: https://github.com/apache/calcite/pull/4452#discussion_r2207252207
##########
mongodb/src/main/java/org/apache/calcite/adapter/mongodb/MongoFilter.java:
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@@ -267,5 +292,15 @@ private void translateOp2(String op, String name,
RexLiteral right,
multimap.put(name, Pair.of(op, right));
}
}
+
+ /** Translates is null/is not null to $exists. */
+ private Void translateUnary(RexCall call,
+ Multimap<String, Pair<String, RexLiteral>> multimap, Map<String,
RexLiteral> eqMap) {
+ final RexNode left = call.operands.get(0);
+ final RexNode right =
rexBuilder.makeNullLiteral(rexBuilder.getTypeFactory().createSqlType(SqlTypeName.NULL));
+ String op = call.getKind() == SqlKind.IS_NOT_NULL ? "$ne" : "$eq";
Review Comment:
Ok, I have added `IS NOT NULL` test and unified code style.
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