[feature](nereids) support timestampdiff function

fe/fe-core/src/main/antlr4/org/apache/doris/nereids/DorisParser.g4

@@ -257,8 +257,20 @@ valueExpression
     | left=valueExpression comparisonOperator right=valueExpression                          #comparison
     ;
 
+datetimeUnit
+    : YEAR | MONTH
+    | WEEK | DAY
+    | HOUR | MINUTE | SECOND
+    ;
+
 primaryExpression
-    : CASE whenClause+ (ELSE elseExpression=expression)? END                                   #searchedCase
+    : name=(TIMESTAMPDIFF | DATEDIFF)
+            LEFT_PAREN
+                unit=datetimeUnit COMMA
+                startTimestamp=valueExpression COMMA
+                endTimestamp=valueExpression
+            RIGHT_PAREN                                                                        #timestampdiff
+    | CASE whenClause+ (ELSE elseExpression=expression)? END                                   #searchedCase
     | CASE value=expression whenClause+ (ELSE elseExpression=expression)? END                  #simpleCase
     | name=CAST LEFT_PAREN expression AS identifier RIGHT_PAREN                                #cast
     | constant                                                                                 #constantDefault

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

@@ -363,6 +363,19 @@ private String paramsToSql() {
         }
         int len = children.size();
         List<String> result = Lists.newArrayList();
+        //XXX_diff are used by nereids only
+        if (fnName.getFunction().equalsIgnoreCase("years_diff")
+                || fnName.getFunction().equalsIgnoreCase("months_diff")
+                || fnName.getFunction().equalsIgnoreCase("days_diff")
+                || fnName.getFunction().equalsIgnoreCase("hours_diff")
+                || fnName.getFunction().equalsIgnoreCase("minutes_diff")
+                || fnName.getFunction().equalsIgnoreCase("seconds_diff")) {
+            sb.append(children.get(1).toSql()).append(", ");
+            sb.append(children.get(0).toSql()).append(")");
+            return sb.toString();
+        }
+        //used by nereids END
+
         if (fnName.getFunction().equalsIgnoreCase("json_array")
                 || fnName.getFunction().equalsIgnoreCase("json_object")) {
             len = len - 1;

fe/fe-core/src/main/java/org/apache/doris/nereids/parser/LogicalPlanBuilder.java

@@ -76,6 +76,7 @@
 import org.apache.doris.nereids.DorisParser.TableAliasContext;
 import org.apache.doris.nereids.DorisParser.TableNameContext;
 import org.apache.doris.nereids.DorisParser.TableValuedFunctionContext;
+import org.apache.doris.nereids.DorisParser.TimestampdiffContext;
 import org.apache.doris.nereids.DorisParser.TvfPropertyContext;
 import org.apache.doris.nereids.DorisParser.TvfPropertyItemContext;
 import org.apache.doris.nereids.DorisParser.TypeConstructorContext;
@@ -124,6 +125,12 @@
 import org.apache.doris.nereids.trees.expressions.TVFProperties;
 import org.apache.doris.nereids.trees.expressions.TimestampArithmetic;
 import org.apache.doris.nereids.trees.expressions.WhenClause;
+import org.apache.doris.nereids.trees.expressions.functions.scalar.DaysDiff;
+import org.apache.doris.nereids.trees.expressions.functions.scalar.HoursDiff;
+import org.apache.doris.nereids.trees.expressions.functions.scalar.MinutesDiff;
+import org.apache.doris.nereids.trees.expressions.functions.scalar.MonthsDiff;
+import org.apache.doris.nereids.trees.expressions.functions.scalar.SecondsDiff;
+import org.apache.doris.nereids.trees.expressions.functions.scalar.YearsDiff;
 import org.apache.doris.nereids.trees.expressions.literal.BigIntLiteral;
 import org.apache.doris.nereids.trees.expressions.literal.BooleanLiteral;
 import org.apache.doris.nereids.trees.expressions.literal.DateLiteral;
@@ -546,6 +553,28 @@ public Expression visitArithmeticBinary(ArithmeticBinaryContext ctx) {
         });
     }
 
+    @Override
+    public Expression visitTimestampdiff(TimestampdiffContext ctx) {
+        Expression start = (Expression) visit(ctx.startTimestamp);
+        Expression end = (Expression) visit(ctx.endTimestamp);
+        String unit = ctx.unit.getText();
+        if ("YEAR".equalsIgnoreCase(unit)) {
+            return new YearsDiff(end, start);
+        } else if ("MONTH".equalsIgnoreCase(unit)) {
+            return new MonthsDiff(end, start);
+        } else if ("DAY".equalsIgnoreCase(unit)) {
+            return new DaysDiff(end, start);
+        } else if ("HOUR".equalsIgnoreCase(unit)) {
+            return new HoursDiff(end, start);
+        } else if ("MINUTE".equalsIgnoreCase(unit)) {
+            return new MinutesDiff(end, start);
+        } else if ("SECOND".equalsIgnoreCase(unit)) {
+            return new SecondsDiff(end, start);
+        }
+        throw new ParseException("Unsupported time stamp diff time unit: " + unit, ctx);
+
+    }
+
     /**
      * Create a value based [[CaseWhen]] expression. This has the following SQL form:
      * {{{

regression-test/data/nereids_syntax_p0/test_timestampdiff.out

@@ -0,0 +1,19 @@
+-- This file is automatically generated. You should know what you did if you want to edit this
+-- !select --
+1
+
+-- !select --
+3
+
+-- !select --
+2
+
+-- !select --
+1
+
+-- !select --
+3
+
+-- !select --
+40
+

regression-test/suites/nereids_syntax_p0/test_timestampdiff.groovy

@@ -0,0 +1,40 @@
+// 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.
+
+suite("test_timestampdiff") {
+    sql "set enable_nereids_planner=true"
+    sql "set enable_fallback_to_original_planner=false"
+    qt_select """
+        SELECT TIMESTAMPDIFF(year,'2003-02-01','2004-05-01');
+    """
+    qt_select """
+        SELECT TIMESTAMPDIFF(MONTH,'2003-02-01','2003-05-01');
+    """
+    qt_select """
+        SELECT TIMESTAMPDIFF(day,'2003-02-01','2003-02-03');
+    """
+    qt_select """
+        SELECT TIMESTAMPDIFF(hour,'2003-02-03 10:00:00','2003-02-03 11:00:00');
+    """
+
+    qt_select """
+        SELECT TIMESTAMPDIFF(minute,'2003-02-03 11:00:00','2003-02-03 11:03:00');
+    """
+    qt_select """
+        SELECT TIMESTAMPDIFF(second,'2003-02-03 11:00:00','2003-02-03 11:00:40');
+    """
+}