Add support for quoted table alias to close #606 (#2306)

You use single quotes or double quotes on table aliases

SELECT col AS "Fancy Name" FROM table   -- Double quotes ✓
SELECT col AS 'Fancy Name' FROM table   -- Single quotes ✓
SELECT col AS `Fancy Name` FROM table   -- Backticks (preexisting)
SELECT col AS [Fancy Name] FROM table   -- Brackets (preexisting)

Author: mathiasrw

src/alasqlparser.jison

@@ -1220,9 +1220,9 @@ ResultColumn
 	| Expression NUMBER
 		{ $1.as = $2; $$ = $1;}
 	| Expression AS StringValue
-		{ $1.as = $3; $$ = $1;}
+		{ $1.as = $3.value; $$ = $1;}
 	| Expression StringValue
-		{ $1.as = $2; $$ = $1;}
+		{ $1.as = $2.value; $$ = $1;}
 	| Expression
 		{ $$ = $1; }
 	;

src/alasqlparser.js

@@ -0,0 +1,87 @@
+if (typeof exports === 'object') {
+	var assert = require('assert');
+	var alasql = require('..');
+}
+
+var test = '606-B';
+
+describe('Test ' + test + ' - Quoted column aliases (double and single quotes)', function () {
+	before(function () {
+		alasql('create database test' + test.replace('-', '_'));
+		alasql('use test' + test.replace('-', '_'));
+	});
+
+	after(function () {
+		alasql('drop database test' + test.replace('-', '_'));
+	});
+
+	it('A) Double-quoted alias with AS keyword', function () {
+		var res = alasql('SELECT 1 AS "Fancy Name"');
+		assert.deepEqual(res, [{'Fancy Name': 1}]);
+	});
+
+	it('B) Double-quoted alias without AS keyword', function () {
+		var res = alasql('SELECT 1 "Another Fancy Name"');
+		assert.deepEqual(res, [{'Another Fancy Name': 1}]);
+	});
+
+	it('C) Single-quoted alias with AS keyword', function () {
+		var res = alasql("SELECT 1 AS 'Single Quoted'");
+		assert.deepEqual(res, [{'Single Quoted': 1}]);
+	});
+
+	it('D) Single-quoted alias without AS keyword', function () {
+		var res = alasql("SELECT 1 'Also Single Quoted'");
+		assert.deepEqual(res, [{'Also Single Quoted': 1}]);
+	});
+
+	it('E) Backtick alias still works', function () {
+		var res = alasql('SELECT 1 AS `Backtick Name`');
+		assert.deepEqual(res, [{'Backtick Name': 1}]);
+	});
+
+	it('F) Bracket alias still works', function () {
+		var res = alasql('SELECT 1 AS [Bracket Name]');
+		assert.deepEqual(res, [{'Bracket Name': 1}]);
+	});
+
+	it('G) Multiple columns with different quote styles', function () {
+		var res = alasql(`SELECT 
+			1 AS "Double Quoted",
+			2 AS 'Single Quoted',
+			3 AS \`Backtick Quoted\`,
+			4 AS [Bracket Quoted]
+		`);
+		assert.deepEqual(res, [
+			{
+				'Double Quoted': 1,
+				'Single Quoted': 2,
+				'Backtick Quoted': 3,
+				'Bracket Quoted': 4,
+			},
+		]);
+	});
+
+	it('H) Quoted alias from table', function () {
+		alasql('CREATE TABLE test_alias (id INT, name STRING)');
+		alasql('INSERT INTO test_alias VALUES (1, "Alice"), (2, "Bob")');
+
+		var res = alasql('SELECT id AS "User ID", name AS "Full Name" FROM test_alias');
+		assert.deepEqual(res, [
+			{'User ID': 1, 'Full Name': 'Alice'},
+			{'User ID': 2, 'Full Name': 'Bob'},
+		]);
+
+		alasql('DROP TABLE test_alias');
+	});
+
+	it('I) Quoted alias with expression', function () {
+		var res = alasql('SELECT 1 + 2 AS "Sum Result"');
+		assert.deepEqual(res, [{'Sum Result': 3}]);
+	});
+
+	it('J) Quoted alias with special characters', function () {
+		var res = alasql('SELECT 1 AS "Column With Spaces & Special!"');
+		assert.deepEqual(res, [{'Column With Spaces & Special!': 1}]);
+	});
+});