chucheng92 commented on code in PR #3579:
URL: https://github.com/apache/calcite/pull/3579#discussion_r1427504943
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core/src/main/java/org/apache/calcite/sql/type/OperandTypes.java:
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@@ -1225,6 +1229,64 @@ private static class MapFromEntriesOperandTypeChecker
}
}
+ /**
+ * Operand type-checking strategy for a ARRAY function, it allows empty
array.
+ *
+ * <p> The reason it overrides SameOperandTypeChecker#checkOperandTypesImpl
is that it needs
+ * to handle the scenario where row/struct type and NULL exist
simultaneously in array.
+ * This scenario need be supported, but will be rejected by the current
checkOperandTypesImpl.
+ */
+ private static class ArrayFunctionOperandTypeChecker
+ extends SameOperandTypeChecker {
+
+ ArrayFunctionOperandTypeChecker() {
+ // The args of array are non-fixed, so we set to -1 here. then
operandCount
+ // can dynamically set according to the number of input args.
+ // details please see SameOperandTypeChecker#getOperandList.
+ super(-1);
+ }
+
+ @Override protected boolean checkOperandTypesImpl(
+ SqlOperatorBinding operatorBinding,
+ boolean throwOnFailure,
+ @Nullable SqlCallBinding callBinding) {
+ if (throwOnFailure && callBinding == null) {
+ throw new IllegalArgumentException(
+ "callBinding must be non-null in case throwOnFailure=true");
+ }
+ int nOperandsActual = nOperands;
+ if (nOperandsActual == -1) {
+ nOperandsActual = operatorBinding.getOperandCount();
+ }
+ RelDataType[] types = new RelDataType[nOperandsActual];
+ final List<Integer> operandList =
+ getOperandList(operatorBinding.getOperandCount());
+ for (int i : operandList) {
+ types[i] = operatorBinding.getOperandType(i);
+ }
+ int prev = -1;
+ for (int i : operandList) {
+ if (prev >= 0) {
Review Comment:
yes, we use `prev` to record previous index. but can also use `i` directly.
updated the PR.
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