dawidwys commented on a change in pull request #12593:
URL: https://github.com/apache/flink/pull/12593#discussion_r439362209
##########
File path:
flink-table/flink-table-common/src/main/java/org/apache/flink/table/types/inference/TypeStrategies.java
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@@ -315,6 +330,32 @@ public static TypeStrategy nullable(TypeStrategy
initialStrategy) {
return Optional.of(fromLogicalToDataType(inferredType));
};
+ /**
+ * Type strategy that returns the type of a string concatenation. It
assumes that the first two
+ * arguments are of the same family of either {@link
LogicalTypeFamily#BINARY_STRING} or
+ * {@link LogicalTypeFamily#CHARACTER_STRING}.
+ */
+ public static final TypeStrategy STRING_CONCAT = callContext -> {
+ final List<DataType> argumentDataTypes =
callContext.getArgumentDataTypes();
+ final LogicalType type1 =
argumentDataTypes.get(0).getLogicalType();
+ final LogicalType type2 =
argumentDataTypes.get(1).getLogicalType();
+ int length = getLength(type1) + getLength(type2);
+ if (length < 0) {
Review comment:
nit: add a comment //overflow
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