[feature](planner) Support select constant from dual syntax sugar (#34200) (#34267)

Author: zy-kkk

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

@@ -222,6 +222,7 @@ DO: 'DO';
 DOUBLE: 'DOUBLE';
 DROP: 'DROP';
 DROPP: 'DROPP';
+DUAL: 'DUAL';
 DUPLICATE: 'DUPLICATE';
 DYNAMIC: 'DYNAMIC';
 ELSE: 'ELSE';
@@ -656,6 +657,9 @@ BRACKETED_COMMENT
     : '/*' {!isHint()}? ( BRACKETED_COMMENT | . )*? ('*/' | {markUnclosedComment();} EOF) -> channel(HIDDEN)
     ;
 
+FROM_DUAL
+    : 'FROM' WS+ 'DUAL' -> channel(HIDDEN);
+
 WS
     : [ \r\n\t]+ -> channel(HIDDEN)
     ;

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

@@ -651,6 +651,7 @@ nonReserved
     | DISTINCTPC
     | DISTINCTPCSA
     | DO
+    | DUAL
     | DYNAMIC
     | ENABLE
     | ENCRYPTKEY

fe/fe-core/src/main/cup/sql_parser.cup

@@ -352,6 +352,7 @@ terminal String
     KW_DOUBLE,
     KW_DROP,
     KW_DROPP,
+    KW_DUAL,
     KW_DUPLICATE,
     KW_DYNAMIC,
     KW_ELSE,
@@ -5627,6 +5628,8 @@ type_function_name ::=
 from_clause ::=
     KW_FROM table_ref_list:l
     {: RESULT = new FromClause(l); :}
+    | KW_FROM KW_DUAL
+    {: RESULT = null; :}
     ;
 
 table_ref_list ::=

fe/fe-core/src/main/jflex/sql_scanner.flex

@@ -202,6 +202,7 @@ import org.apache.doris.qe.SqlModeHelper;
         keywordMap.put("double", new Integer(SqlParserSymbols.KW_DOUBLE));
         keywordMap.put("drop", new Integer(SqlParserSymbols.KW_DROP));
         keywordMap.put("dropp", new Integer(SqlParserSymbols.KW_DROPP));
+        keywordMap.put("dual", new Integer(SqlParserSymbols.KW_DUAL));
         keywordMap.put("duplicate", new Integer(SqlParserSymbols.KW_DUPLICATE));
         keywordMap.put("dynamic", new Integer(SqlParserSymbols.KW_DYNAMIC));
         keywordMap.put("else", new Integer(SqlParserSymbols.KW_ELSE));

regression-test/data/query_p0/dual/dual.out

@@ -0,0 +1,73 @@
+-- This file is automatically generated. You should know what you did if you want to edit this
+-- !sql --
+1
+
+-- !sql --
+1
+
+-- !sql --
+1
+
+-- !sql --
+
+-- !sql --
+
+-- !sql --
+2
+
+-- !sql --
+1
+
+-- !sql --
+1
+
+-- !sql --
+1
+
+-- !sql --
+1
+
+-- !sql --
+1
+
+-- !sql --
+1
+
+-- !sql --
+1
+
+-- !sql --
+
+-- !sql --
+1
+
+-- !sql --
+1
+
+-- !sql --
+1
+
+-- !sql --
+1
+
+-- !sql --
+1
+
+-- !sql --
+1
+
+-- !sql --
+1
+2
+
+-- !sql --
+1
+
+-- !sql --
+1
+1
+1
+
+-- !sql --
+1
+

regression-test/suites/query_p0/dual/dual.groovy

@@ -0,0 +1,93 @@
+// 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('dual') {
+
+    qt_sql 'select 1 from dual'
+    qt_sql 'select 1 from dual where 1'
+    qt_sql 'select 1 from dual where 1 = 1'
+    qt_sql 'select 1 from dual where 0'
+    qt_sql 'select 1 from dual where 1 = 0'
+    qt_sql 'select 1+1 from dual'
+
+    // Testing constant expressions in more complex contexts
+    qt_sql 'select * from (select 1 as a from dual) sub'
+    qt_sql 'select 1 from dual group by 1'
+    qt_sql 'select 1 from dual having 1'
+    qt_sql 'select 1 from dual group by 1 having 1'
+    qt_sql 'select 1 from dual order by 1'
+    qt_sql 'select 1 from dual order by 1 desc'
+    qt_sql 'select 1 from dual order by 1 limit 1'
+    qt_sql 'select 1 from dual order by 1 limit 1 offset 1'
+    qt_sql 'select 1 from dual where 1 in (1)'
+    qt_sql 'select 1 from dual where 1 group by 1'
+    qt_sql 'select 1 from dual where 1 having 1'
+    qt_sql 'select 1 from dual where 1 group by 1 having 1'
+    qt_sql 'select 1 from dual where 1 order by 1'
+    qt_sql 'with cte as (select 1 as a from dual) select a from cte'
+    qt_sql 'select a from (select 1 as a from dual union all select 2 as a from dual) u'
+    qt_sql 'select row_number() over (order by 1) from dual;'
+
+    // Dropping and creating a table named 'dual' to test behavior when dual is a real table
+    sql 'drop table if exists `dual`'
+    sql '''
+        create table `dual` (
+            k0 int
+        )
+        distributed by hash(k0) buckets 16
+        properties(
+            'replication_num'='1'
+        )
+    '''
+    sql 'insert into `dual` values (1)'
+    sql 'insert into `dual` values (2)'
+    sql 'insert into `dual` values (3)'
+
+    qt_sql 'select 1 from `dual`'
+    qt_sql 'select 1 from dual'
+
+    // Tests for dropping 'dual' and ensuring correct error handling
+    test {
+        sql 'drop table if exists dual'
+        exception """DUAL is keyword, maybe `DUAL`"""
+    }
+    sql 'drop table if exists `dual`'
+
+    // Test error handling when table does not exist
+    test {
+        sql "select 1 from `dual`"
+        exception "Unknown table 'dual'"
+    }
+
+    // Disable and enable Nereids planner to check behavior differences
+    sql "set enable_nereids_planner = false"
+    test {
+        sql "select 1 from `dual`"
+        exception "Unknown table 'dual'"
+    }
+    sql "set enable_nereids_planner = true"
+
+    // Tests for unknown column errors
+    test {
+        sql "select a from dual"
+        exception "Unknown column 'a' in 'table list'"
+    }
+    test {
+        sql "select 1, a from dual"
+        exception "Unknown column 'a' in 'table list'"
+    }
+}