strongduanmu commented on code in PR #4411:
URL: https://github.com/apache/calcite/pull/4411#discussion_r2136727190
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core/src/main/java/org/apache/calcite/sql/type/SqlTypeAssignmentRule.java:
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@@ -70,33 +70,73 @@ private SqlTypeAssignmentRule(
// TINYINT is assignable from...
rules.add(SqlTypeName.TINYINT, EnumSet.of(SqlTypeName.TINYINT));
+ // UTINYINT is assignable from...
+ rules.add(SqlTypeName.UTINYINT, EnumSet.of(SqlTypeName.UTINYINT));
+
// SMALLINT is assignable from...
rule.clear();
rule.add(SqlTypeName.TINYINT);
+ rule.add(SqlTypeName.UTINYINT);
rule.add(SqlTypeName.SMALLINT);
rules.add(SqlTypeName.SMALLINT, rule);
+ // USMALLINT is assignable from...
+ rule.clear();
+ rule.add(SqlTypeName.UTINYINT);
+ rule.add(SqlTypeName.TINYINT);
Review Comment:
In MySQL, the range of TINYINT is -128 ~ 127, while the range of USMALLINT
is 0 ~ 65535. Considering that TINYINT includes negative numbers, perhaps we
cannot assign TINYINT to USMALLINT type.
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