Update firebird delete statement to support returning

parser/sql/dialect/firebird/src/main/antlr4/imports/firebird/DMLStatement.g4

@@ -61,7 +61,7 @@ blobValue
     ;
 
 delete
-    : DELETE singleTableClause whereClause?
+    : DELETE singleTableClause whereClause? returningClause?
     ;
 
 singleTableClause

parser/sql/dialect/firebird/src/main/java/org/apache/shardingsphere/sql/parser/firebird/visitor/statement/type/FirebirdDMLStatementVisitor.java

@@ -207,6 +207,9 @@ public ASTNode visitDelete(final DeleteContext ctx) {
             result.setWhere((WhereSegment) visit(ctx.whereClause()));
         }
         result.addParameterMarkerSegments(getParameterMarkerSegments());
+        if (null != ctx.returningClause()) {
+            result.setReturningSegment((ReturningSegment) visit(ctx.returningClause()));
+        }
         return result;
     }
 

parser/sql/statement/type/firebird/src/main/java/org/apache/shardingsphere/sql/parser/statement/firebird/dml/FirebirdDeleteStatement.java

@@ -17,11 +17,23 @@
 
 package org.apache.shardingsphere.sql.parser.statement.firebird.dml;
 
+import lombok.Setter;
+import org.apache.shardingsphere.sql.parser.statement.core.segment.dml.ReturningSegment;
 import org.apache.shardingsphere.sql.parser.statement.core.statement.dml.DeleteStatement;
 import org.apache.shardingsphere.sql.parser.statement.firebird.FirebirdStatement;
 
+import java.util.Optional;
+
 /**
  * Firebird delete statement.
  */
+@Setter
 public final class FirebirdDeleteStatement extends DeleteStatement implements FirebirdStatement {
+
+    private ReturningSegment returningSegment;
+
+    @Override
+    public Optional<ReturningSegment> getReturningSegment() {
+        return Optional.ofNullable(returningSegment);
+    }
 }

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

@@ -44,5 +44,5 @@
     <sql-case id="delete_with_schema" value="DELETE FROM db1.t_order" />
     <sql-case id="delete_with_simple_condition" value="DELETE FROM Q1_2000_sales WHERE amount_sold &lt; 0" db-types="Oracle" />
     <sql-case id="delete_with_output_clause_with_compress_function" value="DELETE FROM player OUTPUT deleted.id,deleted.name, deleted.surname,deleted.datemodifier,COMPRESS(deleted.info) INTO dbo.inactivePlayers WHERE datemodified &lt; @startOfYear" db-types="SQLServer" />
-    <sql-case id="delete_returning_expressions" value="DELETE FROM t2 WHERE id = 2 RETURNING id,t&amp;t" db-types="MySQL" />
+    <sql-case id="delete_returning_expressions" value="DELETE FROM t2 WHERE id = 2 RETURNING id,t&amp;t" db-types="MySQL,Firebird" />
 </sql-cases>