added frame for join statements

src/bison/bison_parser.y

@@ -275,7 +275,7 @@ table_ref_atomic:
 		}
 	|	'(' select_statement ')' {
 			auto tbl = new TableRef(kTableSelect);
-			tbl->stmt = $2;
+			tbl->select = $2;
 			$$ = tbl;
 		}
 	;

src/lib/Statement.h

@@ -12,6 +12,7 @@
 
 typedef enum {
 	kStmtSelect,
+	kStmtJoin,
 	kStmtDelete,
 	kStmtInsert,
 	kStmtCreate
@@ -34,6 +35,14 @@ struct OrderDescription {
 };
 
 
+typedef enum {
+	kJoinInner,
+	kJoinOuter,
+	kJoinLeft,
+	kJoinRight
+} JoinType;
+
+
 struct Statement {
 	Statement(StatementType type) : type(type) {};
 	StatementType type;
@@ -56,6 +65,16 @@ struct SelectStatement : Statement {
 };
 
 
+struct JoinStatement : Statement {
+	JoinStatement() : Statement(kStmtJoin) {};
+
+	TableRef* table1;
+	TableRef* table2;
+	JoinType join_type;
+	Expr* join_condition;
+};
+
+
 struct DeleteStatement : Statement {
 	// TODO
 };

src/lib/Table.h

@@ -1,7 +1,8 @@
-#ifndef __TABLEREF_H_
-#define __TABLEREF_H_
+#ifndef __TABLEREF_H__
+#define __TABLEREF_H__
 
 class SelectStatement;
+class JoinStatement;
 
 /**
  * TableRef
@@ -10,6 +11,7 @@ class SelectStatement;
 typedef enum {
 	kTableName,
 	kTableSelect,
+	kTableJoin,
 	kTableCrossProduct
 } TableRefType;
 
@@ -21,7 +23,8 @@ struct TableRef {
 	TableRefType type;
 
 	char* name;
-	SelectStatement* stmt;
+	SelectStatement* select;
+	JoinStatement* join;
 	List<TableRef*>* list;
 };
 

src/lib/sqlhelper.cpp

@@ -18,7 +18,7 @@ void printTableRefInfo(TableRef* table, uint num_indent) {
       inprint(table->name, num_indent);
       break;
     case kTableSelect:
-      printSelectStatementInfo(table->stmt, num_indent);
+      printSelectStatementInfo(table->select, num_indent);
       break;
     case kTableCrossProduct:
       for (TableRef* tbl : table->list->_vector) printTableRefInfo(tbl, num_indent);