Support Create Table As Syntax (#127)

* support create table as select statement

* Generate bison code

* add test

src/parser/bison_parser.h

@@ -1,8 +1,9 @@
-/* A Bison parser, made by GNU Bison 3.0.4.  */
+/* A Bison parser, made by GNU Bison 3.3.2.  */
 
 /* Bison interface for Yacc-like parsers in C
 
-   Copyright (C) 1984, 1989-1990, 2000-2015 Free Software Foundation, Inc.
+   Copyright (C) 1984, 1989-1990, 2000-2015, 2018-2019 Free Software Foundation,
+   Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -30,6 +31,9 @@
    This special exception was added by the Free Software Foundation in
    version 2.2 of Bison.  */
 
+/* Undocumented macros, especially those whose name start with YY_,
+   are private implementation details.  Do not rely on them.  */
+
 #ifndef YY_HSQL_BISON_PARSER_H_INCLUDED
 # define YY_HSQL_BISON_PARSER_H_INCLUDED
 /* Debug traces.  */
@@ -48,7 +52,7 @@
 extern int hsql_debug;
 #endif
 /* "%code requires" blocks.  */
-#line 35 "bison_parser.y" /* yacc.c:1909  */
+#line 35 "bison_parser.y" /* yacc.c:1921  */
 
 // %code requires block
 
@@ -72,7 +76,7 @@ extern int hsql_debug;
 				} \
 		}
 
-#line 76 "bison_parser.h" /* yacc.c:1909  */
+#line 80 "bison_parser.h" /* yacc.c:1921  */
 
 /* Token type.  */
 #ifndef HSQL_TOKENTYPE
@@ -230,7 +234,7 @@ extern int hsql_debug;
 
 union HSQL_STYPE
 {
-#line 95 "bison_parser.y" /* yacc.c:1909  */
+#line 95 "bison_parser.y" /* yacc.c:1921  */
 
 	double fval;
 	int64_t ival;
@@ -274,7 +278,7 @@ union HSQL_STYPE
 	std::vector<hsql::OrderDescription*>* order_vec;
 	std::vector<hsql::WithDescription*>* with_description_vec;
 
-#line 278 "bison_parser.h" /* yacc.c:1909  */
+#line 282 "bison_parser.h" /* yacc.c:1921  */
 };
 
 typedef union HSQL_STYPE HSQL_STYPE;

src/parser/bison_parser.y

@@ -430,6 +430,13 @@ create_statement:
 			$$->tableName = $4.name;
 			$$->columns = $6;
 		}
+	|	CREATE TABLE opt_not_exists table_name AS select_statement {
+			$$ = new CreateStatement(kCreateTable);
+			$$->ifNotExists = $3;
+			$$->schema = $4.schema;
+			$$->tableName = $4.name;
+			$$->select = $6;
+		}
 	|	CREATE VIEW opt_not_exists table_name opt_column_list AS select_statement {
 			$$ = new CreateStatement(kCreateView);
 			$$->ifNotExists = $3;

test/queries/queries-good.sql

@@ -26,6 +26,8 @@ CREATE TABLE "table" FROM TBL FILE 'students.tbl'
 CREATE TABLE IF NOT EXISTS "table" FROM TBL FILE 'students.tbl'
 CREATE TABLE students (name TEXT, student_number INTEGER, city TEXT, grade DOUBLE)
 CREATE TABLE teachers (name VARCHAR(30), student_number LONG, city CHAR(10), grade FLOAT)
+CREATE TABLE students_2 AS SELECT * FROM students
+CREATE TABLE students_3 AS SELECT city, grade FROM students WHERE grade > 3.0
 # Multiple statements
 CREATE TABLE "table" FROM TBL FILE 'students.tbl'; SELECT * FROM "table";
 # INSERT

test/sql_tests.cpp

@@ -58,6 +58,24 @@ TEST(CreateStatementTest) {
   ASSERT_EQ(stmt->columns->at(3)->nullable, false);
 }
 
+TEST(CreateAsSelectStatementTest) {
+  SQLParserResult result;
+  SQLParser::parse("CREATE TABLE students_2 AS SELECT student_number, grade FROM students", &result);
+
+  ASSERT(result.isValid());
+  ASSERT_EQ(result.size(), 1);
+  ASSERT_EQ(result.getStatement(0)->type(), kStmtCreate);
+
+  const CreateStatement* stmt = (const CreateStatement*) result.getStatement(0);
+  ASSERT_EQ(stmt->type, kCreateTable);
+  ASSERT_STREQ(stmt->tableName, "students_2");
+  ASSERT_NULL(stmt->columns);
+  ASSERT_NOTNULL(stmt->select);
+  ASSERT(stmt->select->selectList->at(0)->isType(kExprColumnRef));
+  ASSERT_STREQ(stmt->select->selectList->at(0)->getName(), "student_number");
+  ASSERT(stmt->select->selectList->at(1)->isType(kExprColumnRef));
+  ASSERT_STREQ(stmt->select->selectList->at(1)->getName(), "grade");
+}
 
 TEST(UpdateStatementTest) {
   SQLParserResult result;