Fix SHOW COLUMNS and SHOW INDEX to resolve qualified table names

src/78show.js

@@ -72,7 +72,7 @@ yy.ShowColumns.prototype.toString = function () {
 };
 
 yy.ShowColumns.prototype.execute = function (databaseid, params, cb) {
-	var db = alasql.databases[this.databaseid || databaseid];
+	var db = alasql.databases[this.table.databaseid || this.databaseid || databaseid];
 	var table = db.tables[this.table.tableid];
 
 	if (table && table.columns) {
@@ -101,7 +101,7 @@ yy.ShowIndex.prototype.toString = function () {
 	return s;
 };
 yy.ShowIndex.prototype.execute = function (databaseid, params, cb) {
-	var db = alasql.databases[this.databaseid || databaseid];
+	var db = alasql.databases[this.table.databaseid || this.databaseid || databaseid];
 	var table = db.tables[this.table.tableid];
 	var res = [];
 	if (table && table.indices) {

test/test2200.js

@@ -0,0 +1,82 @@
+if (typeof exports === 'object') {
+	var assert = require('assert');
+	var alasql = require('..');
+}
+
+var testId = '2200';
+
+describe(
+	'Test ' + testId + ' - SHOW COLUMNS and SHOW INDEX with qualified table names',
+	function () {
+		before(function () {
+			alasql('CREATE DATABASE test2200a');
+			alasql('CREATE DATABASE test2200b');
+			alasql('USE test2200a');
+			alasql('CREATE TABLE table1 (col1 INT, col2 VARCHAR(50))');
+			alasql('CREATE INDEX idx_col1 ON table1(col1)');
+			alasql('USE test2200b');
+			alasql('CREATE TABLE table2 (col3 DECIMAL(10,2), col4 BOOLEAN)');
+			alasql('CREATE INDEX idx_col3 ON table2(col3)');
+		});
+
+		it('1. SHOW COLUMNS with unqualified name (USE context)', function () {
+			alasql('USE test2200a');
+			var res = alasql('SHOW COLUMNS FROM table1');
+			assert.equal(res.length, 2);
+			assert.equal(res[0].columnid, 'col1');
+			assert.equal(res[0].dbtypeid, 'INT');
+			assert.equal(res[1].columnid, 'col2');
+			assert.equal(res[1].dbtypeid, 'VARCHAR');
+			assert.equal(res[1].dbsize, 50);
+		});
+
+		it('2. SHOW COLUMNS with qualified name (database.table)', function () {
+			// This test should work regardless of current USE context
+			alasql('USE test2200b');
+			var res = alasql('SHOW COLUMNS FROM test2200a.table1');
+			assert.equal(res.length, 2, 'Should return 2 columns');
+			assert.equal(res[0].columnid, 'col1');
+			assert.equal(res[0].dbtypeid, 'INT');
+			assert.equal(res[1].columnid, 'col2');
+			assert.equal(res[1].dbtypeid, 'VARCHAR');
+			assert.equal(res[1].dbsize, 50);
+		});
+
+		it('3. SHOW INDEX with unqualified name (USE context)', function () {
+			alasql('USE test2200a');
+			var res = alasql('SHOW INDEX FROM table1');
+			assert.equal(res.length, 1);
+			assert.ok(res[0].hh, 'Should have index hash');
+		});
+
+		it('4. SHOW INDEX with qualified name (database.table)', function () {
+			// This test should work regardless of current USE context
+			alasql('USE test2200b');
+			var res = alasql('SHOW INDEX FROM test2200a.table1');
+			assert.equal(res.length, 1, 'Should return 1 index');
+			assert.ok(res[0].hh, 'Should have index hash');
+		});
+
+		it('5. SHOW COLUMNS with qualified name in different database', function () {
+			alasql('USE test2200a');
+			var res = alasql('SHOW COLUMNS FROM test2200b.table2');
+			assert.equal(res.length, 2, 'Should return 2 columns');
+			assert.equal(res[0].columnid, 'col3');
+			assert.equal(res[0].dbtypeid, 'DECIMAL');
+			assert.equal(res[1].columnid, 'col4');
+			assert.equal(res[1].dbtypeid, 'BOOLEAN');
+		});
+
+		it('6. SHOW INDEX with qualified name in different database', function () {
+			alasql('USE test2200a');
+			var res = alasql('SHOW INDEX FROM test2200b.table2');
+			assert.equal(res.length, 1, 'Should return 1 index');
+			assert.ok(res[0].hh, 'Should have index hash');
+		});
+
+		after(function () {
+			alasql('DROP DATABASE test2200a');
+			alasql('DROP DATABASE test2200b');
+		});
+	}
+);