Support Oracle pivot with alias SQL parse (#36761)

* Support Oracle pivot with alias SQL parse

* Support Oracle pivot with alias SQL parse

Author: FlyingZC

parser/sql/engine/dialect/oracle/src/main/antlr4/imports/oracle/DMLStatement.g4

@@ -517,7 +517,7 @@ modifyExternalTableProperties
 
 pivotClause
     : PIVOT XML?
-    LP_ aggregationFunction (AS? alias)? (COMMA_ aggregationFunction (AS? alias)?)* pivotForClause pivotInClause RP_
+    LP_ aggregationFunction (AS? alias)? (COMMA_ aggregationFunction (AS? alias)?)* pivotForClause pivotInClause RP_ alias?
     ;
 
 pivotForClause
@@ -535,7 +535,7 @@ pivotInClauseExpr
     ;
 
 unpivotClause
-    : UNPIVOT ((INCLUDE | EXCLUDE) NULLS)? LP_ columnNames pivotForClause unpivotInClause RP_
+    : UNPIVOT ((INCLUDE | EXCLUDE) NULLS)? LP_ (columnName | columnNames) pivotForClause unpivotInClause RP_ alias?
     ;
 
 unpivotInClause

test/it/parser/src/main/resources/case/dml/select-special-function.xml

@@ -676,19 +676,24 @@
     </select>
 
     <select sql-case-id="select_pivot">
-        <projections start-index="7" stop-index="7">
-            <shorthand-projection start-index="7" stop-index="7"/>
+        <projections start-index="7" stop-index="18">
+            <shorthand-projection start-index="7" stop-index="18">
+                <owner name="pivotAlias" start-index="7" stop-index="16"/>
+                <actual-projections start-index="0" stop-index="0"/>
+            </shorthand-projection>
         </projections>
-        <from>
-            <subquery-table start-index="14" stop-index="34" >
+        <from start-index="25" stop-index="104">
+            <subquery-table start-index="25" stop-index="45">
                 <subquery>
                     <select>
-                        <projections start-index="22" stop-index="22">
-                            <shorthand-projection start-index="22" stop-index="22"/>
-                        </projections>
-                        <from start-index="29" stop-index="33">
-                            <simple-table name="sales" start-index="29" stop-index="33"/>
+                        <from start-index="40" stop-index="44">
+                            <simple-table name="sales" start-index="40" stop-index="44"/>
                         </from>
+                        <projections start-index="33" stop-index="33">
+                            <shorthand-projection start-index="33" stop-index="33">
+                                <actual-projections start-index="0" stop-index="0"/>
+                            </shorthand-projection>
+                        </projections>
                     </select>
                 </subquery>
             </subquery-table>

test/it/parser/src/main/resources/sql/supported/dml/select-special-function.xml

@@ -48,7 +48,7 @@
     <sql-case id="select_mod_function" value="SELECT MOD(order_id, 1) from t_order" db-types="PostgreSQL,openGauss" />
     <sql-case id="select_sys_xml_agg" value="SELECT SYS_XMLAGG(SYS_XMLGEN(last_name)) XMLAGG FROM employees WHERE last_name LIKE 'R%' ORDER BY xmlagg;" db-types="Oracle" />
     <sql-case id="select_set_function" value="SELECT customer_id, SET(cust_address_ntab) address FROM customers_demo ORDER BY customer_id;" db-types="Oracle" />
-    <sql-case id="select_pivot" value="SELECT * FROM (SELECT * FROM sales) PIVOT (SUM(amount) FOR (year, month) IN ((2018, 'Jan'), (2018, 'Feb')))" db-types="Oracle"/>
+    <sql-case id="select_pivot" value="SELECT pivotAlias.* FROM (SELECT * FROM sales) PIVOT (SUM(amount) FOR month IN ('Jan', 'Feb')) pivotAlias" db-types="Oracle"/>
     <sql-case id="select_unpivot" value="SELECT * FROM (SELECT * FROM sales) UNPIVOT ((cert_type, cert_number) FOR cert_source IN ((primary_cert_type, primary_cert_no), (alt_cert_type1, alt_cert_no1), (alt_cert_type2, alt_cert_no2)))" db-types="Oracle"/>
     <sql-case id="select_string_split_function" value="SELECT value as tag, COUNT(*) AS [number_of_articles] FROM Product CROSS APPLY STRING_SPLIT(Tags, ',') GROUP BY value HAVING COUNT(*) > 2 ORDER BY COUNT(*) DESC"  db-types="SQLServer"/>
     <sql-case id="select_from_open_json_function" value="SELECT * FROM OPENJSON(@array) WITH (  month VARCHAR(3), temp int, month_id tinyint '$.sql:identity()') as months" db-types="SQLServer"/>