danny0405 commented on a change in pull request #1507: [CALCITE-3414] In
calcite-core, use RexToLixTranslator.convert for type conversion code
generation uniformly
URL: https://github.com/apache/calcite/pull/1507#discussion_r337312989
##########
File path:
core/src/main/java/org/apache/calcite/adapter/enumerable/RexToLixTranslator.java
##########
@@ -1143,14 +1156,20 @@ public static Expression convert(Expression operand,
Type fromType,
"toString",
operand));
} else {
- // E.g. from "BigDecimal" to "String"
- // Generate "x == null ? null : x.toString()"
- return Expressions.condition(
- Expressions.equal(operand, RexImpTable.NULL_EXPR),
- RexImpTable.NULL_EXPR,
- Expressions.call(
- operand,
- "toString"));
+ Expression result;
+ try {
+ // Try to call "toString()" method
+ // E.g. from "Integer" to "String"
+ // Generate "x == null ? null : x.toString()"
+ result = Expressions.condition(
+ Expressions.equal(operand, RexImpTable.NULL_EXPR),
+ RexImpTable.NULL_EXPR,
+ Expressions.call(operand, "toString"));
+ } catch (Exception e) {
+ // No "toString()" method, fall through to (String)x
Review comment:
Do you think we can make an effort for `Expressions.call(operand,
"toString"))` to get the right `toString` method ? Even though it uses the Java
reflection.
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