danny0405 commented on a change in pull request #1437: [CALCITE-3318]
Preserving CAST of STRING operands in comparison operator
URL: https://github.com/apache/calcite/pull/1437#discussion_r335992408
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File path:
core/src/main/java/org/apache/calcite/sql/dialect/BigQuerySqlDialect.java
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@@ -99,6 +103,14 @@ public BigQuerySqlDialect(SqlDialect.Context context) {
return emulateNullDirectionWithIsNull(node, nullsFirst, desc);
}
+ @Override public boolean supportsImplicitTypeCoercion(RexCall node) {
+ if (!super.supportsImplicitTypeCoercion(node)) {
+ return false;
+ }
+ RexNode operand = node.getOperands().get(0);
+ return operand instanceof RexLiteral &&
!SqlTypeFamily.NUMERIC.contains(node.type);
+ }
+
Review comment:
From this code, you mean we can strip the case only if:
- The first operand is a STRING literal
- The second operand is not a NUMERIC
This is weird, can you please conform the type coercion rules ? Especially
for the operators we strip the cast from: `>` `>=` `<` `<=` `IS NOT DISTINCT
FROM` `<>`
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