xy720 commented on code in PR #16444:
URL: https://github.com/apache/doris/pull/16444#discussion_r1099759491


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fe/fe-core/src/main/java/org/apache/doris/analysis/StructLiteral.java:
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@@ -0,0 +1,150 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package org.apache.doris.analysis;
+
+import org.apache.doris.catalog.StructField;
+import org.apache.doris.catalog.StructType;
+import org.apache.doris.catalog.Type;
+import org.apache.doris.common.AnalysisException;
+import org.apache.doris.thrift.TExprNode;
+import org.apache.doris.thrift.TExprNodeType;
+
+import org.apache.commons.lang.StringUtils;
+
+import java.io.DataInput;
+import java.io.DataOutput;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class StructLiteral extends LiteralExpr {
+    // only for persist
+    public StructLiteral() {
+        type = new StructType();
+        children = new ArrayList<>();
+    }
+
+    public StructLiteral(LiteralExpr... exprs) throws AnalysisException {
+        type = new StructType();
+        children = new ArrayList<>();
+        for (LiteralExpr expr : exprs) {
+            if (!type.supportSubType(expr.getType())) {
+                throw new AnalysisException("Invalid element type in STRUCT.");
+            }
+            ((StructType) type).addField(new StructField(expr.getType()));
+            children.add(expr);
+        }
+    }
+
+    protected StructLiteral(StructLiteral other) {
+        super(other);
+    }
+
+    @Override
+    protected String toSqlImpl() {
+        List<String> list = new ArrayList<>(children.size());
+        children.forEach(v -> list.add(v.toSqlImpl()));
+        return "STRUCT(" + StringUtils.join(list, ", ") + ")";
+    }
+
+    @Override
+    public String toDigestImpl() {
+        List<String> list = new ArrayList<>(children.size());
+        children.forEach(v -> list.add(v.toDigestImpl()));
+        return "STRUCT(" + StringUtils.join(list, ", ") + ")";
+    }
+
+    @Override
+    public String getStringValue() {
+        List<String> list = new ArrayList<>(children.size());
+        children.forEach(v -> list.add(v.getStringValue()));
+        return "{" + StringUtils.join(list, ", ") + "}";

Review Comment:
   May be we should support '(' ')' only in insert stmt in future.
   For select stmt and other places, we keep using brace{}.



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