snuyanzin commented on a change in pull request #2413:
URL: https://github.com/apache/calcite/pull/2413#discussion_r631833702
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File path:
core/src/main/java/org/apache/calcite/rel/type/RelDataTypeFactoryImpl.java
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@@ -257,6 +260,35 @@ private RelDataType createStructType(
return createTypeWithNullability(builder.build(), isNullable);
}
+ protected @Nullable RelDataType leastRestrictiveCollectionType(
+ final List<RelDataType> types, SqlTypeName sqlTypeName) {
+ assert sqlTypeName == SqlTypeName.ARRAY
+ || sqlTypeName == SqlTypeName.MULTISET || sqlTypeName ==
SqlTypeName.MAP;
+ boolean isNullable = false;
+ for (RelDataType type : types) {
+ isNullable |= type.isNullable();
+ }
+ if (sqlTypeName == SqlTypeName.MAP) {
+ RelDataType keyType = leastRestrictive(
+ Util.transform(types, t -> Objects.requireNonNull(t.getKeyType())));
Review comment:
Thanks @vlsi
Do you think it makes to create a separate issue for an alternate approach?
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