hailin0 commented on code in PR #2855:
URL: https://github.com/apache/calcite/pull/2855#discussion_r922942312
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core/src/main/java/org/apache/calcite/sql/validate/implicit/AbstractTypeCoercion.java:
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@@ -436,11 +436,13 @@ private RelDataType getTightestCommonTypeOrThrow(
// 2. VARCHAR has 65536 as default precision.
// 3. Following MS-SQL: BINARY or BOOLEAN can be casted to VARCHAR.
if (SqlTypeUtil.isAtomic(type1) && SqlTypeUtil.isCharacter(type2)) {
- resultType = factory.createSqlType(SqlTypeName.VARCHAR);
+ resultType =
factory.createTypeWithNullability(factory.createSqlType(SqlTypeName.VARCHAR),
+ type1.isNullable() || type2.isNullable());
}
if (SqlTypeUtil.isCharacter(type1) && SqlTypeUtil.isAtomic(type2)) {
- resultType = factory.createSqlType(SqlTypeName.VARCHAR);
+ resultType =
factory.createTypeWithNullability(factory.createSqlType(SqlTypeName.VARCHAR),
+ type1.isNullable() || type2.isNullable());
}
Review Comment:
https://github.com/apache/calcite/blob/main/core/src/main/java/org/apache/calcite/sql/validate/implicit/AbstractTypeCoercion.java#L543-L548
Other type conversions already handle nullable settings in the
getTightestCommonType method
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