add back impala related comments

fe/fe-core/src/main/java/org/apache/doris/analysis/AggregateInfo.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/AggregateInfo.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/AggregateInfoBase.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/AggregateInfoBase.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/AnalyticExpr.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/AnalyticExpr.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/AnalyticInfo.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/AnalyticInfo.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/AnalyticWindow.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/AnalyticWindow.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/Analyzer.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/Analyzer.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/ArithmeticExpr.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/ArithmeticExpr.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/BetweenPredicate.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/BetweenPredicate.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/BinaryPredicate.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/BinaryPredicate.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/BoolLiteral.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/BoolLiteral.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/CaseExpr.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/CaseExpr.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/CaseWhenClause.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/CaseWhenClause.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/CastExpr.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/CastExpr.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/ColumnDef.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/ColumnDef.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/CompoundPredicate.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/CompoundPredicate.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/DateLiteral.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/DateLiteral.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/DescriptorTable.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/DescriptorTable.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/Expr.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/Expr.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/ExprId.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/ExprId.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/ExprSubstitutionMap.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/ExprSubstitutionMap.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/FromClause.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/FromClause.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/FunctionArgs.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/FunctionArgs.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/FunctionArgsDef.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/FunctionArgsDef.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/FunctionCallExpr.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/FunctionCallExpr.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/FunctionName.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/FunctionName.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/FunctionParams.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/FunctionParams.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/InPredicate.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/InPredicate.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/InlineViewRef.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/InlineViewRef.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/IsNullPredicate.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/IsNullPredicate.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/JoinOperator.java

@@ -14,6 +14,10 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/JoinOperator.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/LikePredicate.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/LikePredicate.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/LimitElement.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/LimitElement.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/LiteralExpr.java

@@ -14,6 +14,10 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/LiteralExpr.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/NullLiteral.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/NullLiteral.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/OrderByElement.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/OrderByElement.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/ParseNode.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/ParseNode.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/Predicate.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/Predicate.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/QueryStmt.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/QueryStmt.java
+// and modified by Doris
 
 package org.apache.doris.analysis;
 

fe/fe-core/src/main/java/org/apache/doris/analysis/SelectList.java

@@ -14,6 +14,9 @@
 // KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// This file is copied from
+// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/SelectList.java
+// and modified by Doris
 
 package org.apache.doris.analysis;