[GitHub] [flink] shenzhu commented on a change in pull request #17919: [FLINK-24419][table-planner] Trim to precision when casting to BINARY/VARBINARY

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shenzhu commented on a change in pull request #17919:
URL: https://github.com/apache/flink/pull/17919#discussion_r757682218



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File path: flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/functions/casting/StringToBinaryCastRule.java
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@@ -45,6 +52,28 @@ public String generateExpression(
             String inputTerm,
             LogicalType inputLogicalType,
             LogicalType targetLogicalType) {
-        return methodCall(inputTerm, "toBytes");
+        int inputLength = Integer.MAX_VALUE;
+        if (inputLogicalType instanceof CharType) {
+            inputLength = ((CharType) inputLogicalType).getLength();
+        } else if (inputLogicalType instanceof VarCharType) {
+            inputLength = ((VarCharType) inputLogicalType).getLength();
+        }
+
+        int targetLength = Integer.MAX_VALUE;
+        if (targetLogicalType instanceof BinaryType) {
+            targetLength = ((BinaryType) targetLogicalType).getLength();
+        } else if (targetLogicalType instanceof VarBinaryType) {
+            targetLength = ((VarBinaryType) targetLogicalType).getLength();
+        }
+        targetLength = Math.min(targetLength, inputLength);

Review comment:
       Hey @matriv , thanks for your review! I will update the code here.




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