libenchao commented on code in PR #2853:
URL: https://github.com/apache/calcite/pull/2853#discussion_r989705887
##########
core/src/main/java/org/apache/calcite/rex/RexBuilder.java:
##########
@@ -1355,10 +1356,14 @@ public RexNode makeIn(RexNode arg, List<? extends
RexNode> ranges) {
if (areAssignable(arg, ranges)) {
final Sarg sarg = toSarg(Comparable.class, ranges, RexUnknownAs.UNKNOWN);
if (sarg != null) {
- final RexNode range0 = ranges.get(0);
+ final List<RelDataType> types = ranges.stream()
+ .map(RexNode::getType)
+ .collect(Collectors.toList());
+ RelDataType searchType = typeFactory.leastRestrictive(types);
+ searchType = searchType == null ? ranges.get(0).getType() : searchType;
Review Comment:
If`searchType == null` is `true`, do we really need to proceed with
`ranges.get(0).getType()`?
##########
core/src/test/java/org/apache/calcite/rel/rel2sql/RelToSqlConverterTest.java:
##########
@@ -1252,6 +1253,26 @@ private static String toSql(RelNode root, SqlDialect
dialect,
relFn(relFn).optimize(rules, null).ok(expected);
}
+ /** Test case for
+ * <a
href="https://issues.apache.org/jira/browse/CALCITE-4632";>[CALCITE-4632]
+ * Find the least restrictive datatype for SARG</a>. */
+ @Test void testLeastRestrictiveTypeForSarg() {
Review Comment:
As discussed in the JIRA, the root cause is not from `RelToSqlConverter`, so
I'm not sure this is the right place to add tests. How about we add more tests
in `RexBuilderTest` and assert the `RexNode`'s type returned from
`RexBuilder#makeIn`?
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