Support for the FOR TIMESTAMP query hint

Author: ccxxxyy

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

@@ -351,6 +351,7 @@ queryHint
     | USE HINT LP_ useHitName (COMMA_ useHitName)* RP_
     | USE PLAN NCHAR_TEXT
     | LABEL EQ_ stringLiterals
+    | FOR TIMESTAMP AS OF stringLiterals
     ;
 
 optimizeForParameter

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

@@ -11760,4 +11760,13 @@
             <simple-table name="Person" start-index="14" stop-index="19" />
         </from>
     </select>
+
+    <select sql-case-id="select_for_timestamp_as_of_hint">
+        <projections start-index="7" stop-index="7">
+            <shorthand-projection start-index="7" stop-index="7" />
+        </projections>
+        <from>
+            <simple-table name="Person" start-index="14" stop-index="19" />
+        </from>
+    </select>
 </sql-parser-test-cases>

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

@@ -374,4 +374,5 @@
     <sql-case id="select_fast_hint" value="SELECT * FROM Person OPTION (HASH GROUP, FAST 10);" db-types="SQLServer"/>
     <sql-case id="select_use_hint" value="SELECT * FROM Person OPTION (RECOMPILE, USE HINT ('ASSUME_MIN_SELECTIVITY_FOR_FILTER_ESTIMATES', 'DISABLE_PARAMETER_SNIFFING'));" db-types="SQLServer"/>
     <sql-case id="select_maxdop_hint" value="SELECT * FROM Person OPTION (MAXDOP 2);" db-types="SQLServer"/>
+    <sql-case id="select_for_timestamp_as_of_hint" value="SELECT * FROM Person OPTION (FOR TIMESTAMP AS OF '2024-03-13T19:39:35.28');" db-types="SQLServer"/>
 </sql-cases>