Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1634#discussion_r52925323
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/codegen/OperatorCodeGen.scala
---
@@ -18,20 +18,56 @@
package org.apache.flink.api.table.codegen
import org.apache.flink.api.common.typeinfo.BasicTypeInfo.BOOLEAN_TYPE_INFO
-import org.apache.flink.api.common.typeinfo.TypeInformation
+import org.apache.flink.api.common.typeinfo.{NumericTypeInfo,
TypeInformation}
import org.apache.flink.api.table.codegen.CodeGenUtils._
object OperatorCodeGen {
- def generateArithmeticOperator(
+ def generateArithmeticOperator(
operator: String,
nullCheck: Boolean,
resultType: TypeInformation[_],
left: GeneratedExpression,
right: GeneratedExpression)
: GeneratedExpression = {
- generateOperatorIfNotNull(nullCheck, resultType, left, right) {
+ // String arithmetic // TODO rework
+ if (isString(left)) {
+ generateOperatorIfNotNull(nullCheck, resultType, left, right) {
(leftTerm, rightTerm) => s"$leftTerm $operator $rightTerm"
+ }
+ }
+ // Numeric arithmetic
+ else if (isNumeric(left) && isNumeric(right)) {
+ val leftType = left.resultType.asInstanceOf[NumericTypeInfo[_]]
+ val rightType = right.resultType.asInstanceOf[NumericTypeInfo[_]]
+
+ generateOperatorIfNotNull(nullCheck, resultType, left, right) {
+ (leftTerm, rightTerm) =>
+ // insert auto casting for "narrowing primitive conversions"
+ if (leftType != rightType) {
+ // leftType can not be casted to rightType automatically ->
narrow
+ if (!leftType.shouldAutocastTo(rightType)) {
--- End diff --
Just checked, double is actually downcasted.
The following test fails:
```
val t = env.fromElements((100000.0d: Double, 1: Byte)).toTable.select('_1 +
'_2)
val expected = "100001.0"
```
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