chucheng92 commented on code in PR #3579:
URL: https://github.com/apache/calcite/pull/3579#discussion_r1424776526
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core/src/main/java/org/apache/calcite/sql/fun/SqlLibraryOperators.java:
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@@ -1061,23 +1061,29 @@ static RelDataType deriveTypeSplit(SqlOperatorBinding
operatorBinding,
private static RelDataType arrayReturnType(SqlOperatorBinding opBinding) {
final List<RelDataType> operandTypes = opBinding.collectOperandTypes();
- // only numeric & character types check
+ // only numeric & character types check, this is a special spark array case
+ // the form like ARRAY(1, 2, '3') will return ["1", "2", "3"]
boolean hasNumeric = false;
boolean hasCharacter = false;
boolean hasOthers = false;
for (RelDataType type : operandTypes) {
SqlTypeFamily family = type.getSqlTypeName().getFamily();
- requireNonNull(family, "array element type family");
+ // some types such as Row, the family is null, fallback to normal
inferred type logic
+ if (family == null) {
+ hasOthers = true;
+ break;
+ }
+ // skip it because we allow NULL literal
+ if (SqlTypeUtil.isNull(type)) {
+ continue;
Review Comment:
thanks for reviewing. the old code use `case NULL`, the NULL is
SqlTypeFamily. however some other types such as UNKNOWN, the family is also
NULL. here just use SqlTypeUtil#isNull to truly indicate NULL type. use
continue will skip this null literal element.
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