eldenmoon commented on code in PR #55877:
URL: https://github.com/apache/doris/pull/55877#discussion_r2339876829
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fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/scalar/ToJson.java:
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@@ -85,6 +96,13 @@ public List<FunctionSignature> getSignatures() {
DataType firstChildType = child(0).getDataType();
if (firstChildType.isStructType() || firstChildType.isArrayType()) {
return
ImmutableList.of(FunctionSignature.ret(JsonType.INSTANCE).args(firstChildType));
+ }
+ if (firstChildType.isMapType()) {
+ MapType mapType = (MapType) firstChildType;
+ if (!mapType.getKeyType().isStringLikeType()) {
+ throw new IllegalArgumentException("to_json only support map
with string-like key type");
Review Comment:
如果是这个结构呢`map<string, map<int, string>> `
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