refactor show indexes query type

Eliminating more cases where we are doing string compares to determine
a query that shows indexes for a given table

lib/dialects/abstract/query-generator.js

@@ -524,15 +524,15 @@ module.exports = (function() {
     },
 
     /*
-      Returns an show index query.
+      Returns a query listing indexes for a given table.
       Parameters:
         - tableName: Name of an existing table.
         - options:
           - database: Name of the database.
     */
     /* istanbul ignore next */
-    showIndexQuery: function(tableName, options) {
-      throwMethodUndefined('showIndexQuery');
+    showIndexesQuery: function(tableName, options) {
+      throwMethodUndefined('showIndexesQuery');
     },
 
     /*

lib/dialects/abstract/query.js

@@ -133,6 +133,10 @@ module.exports = (function() {
     }));
   };
 
+  AbstractQuery.prototype.isShowIndexesQuery = function () {
+    return this.options.type === QueryTypes.SHOWINDEXES;
+  };
+
   AbstractQuery.prototype.isSelectQuery = function() {
     return this.options.type === QueryTypes.SELECT;
   };

lib/dialects/mssql/query-generator.js

@@ -293,7 +293,7 @@ module.exports = (function() {
       });
     },
 
-    showIndexQuery: function(tableName, options) {
+    showIndexesQuery: function(tableName, options) {
       // FIXME: temporary until I implement proper schema support
       var dequotedTableName = tableName.toString().replace(/['"]+/g, '');
       var sql = "EXEC sys.sp_helpindex @objname = N'[<%= tableName %>]';";

lib/dialects/mysql/query-generator.js

@@ -226,7 +226,7 @@ module.exports = (function() {
       return 'DELETE FROM ' + table + ' WHERE ' + where + limit;
     },
 
-    showIndexQuery: function(tableName, options) {
+    showIndexesQuery: function(tableName, options) {
       var sql = 'SHOW INDEX FROM <%= tableName %><%= options %>';
       return Utils._.template(sql)({
         tableName: this.quoteTable(tableName),

lib/dialects/mysql/query.js

@@ -160,10 +160,6 @@ module.exports = (function() {
     }
   };
 
-  Query.prototype.isShowIndexesQuery = function () {
-    return this.sql.toLowerCase().indexOf('show index from') === 0;
-  };
-
   Query.prototype.handleShowIndexesQuery = function (data) {
     // Group by index name, and collect all fields
     data = Utils._.foldl(data, function (acc, item) {

lib/dialects/postgres/query-generator.js

@@ -447,7 +447,7 @@ module.exports = (function() {
       return Utils._.template(query)(replacements);
     },
 
-    showIndexQuery: function(tableName, options) {
+    showIndexesQuery: function(tableName, options) {
       // This is ARCANE!
       var query = "SELECT i.relname AS name, ix.indisprimary AS primary, ix.indisunique AS unique, ix.indkey AS indkey, array_agg(a.attnum) as column_indexes, array_agg(a.attname) AS column_names, pg_get_indexdef(ix.indexrelid) AS definition FROM pg_class t, pg_class i, pg_index ix, pg_attribute a WHERE t.oid = ix.indrelid AND i.oid = ix.indexrelid AND a.attrelid = t.oid AND a.attnum = ANY(ix.indkey) AND t.relkind = 'r' and t.relname = '<%= tableName %>' GROUP BY i.relname, ix.indexrelid, ix.indisprimary, ix.indisunique, ix.indkey ORDER BY i.relname;";
 

lib/dialects/postgres/query.js

@@ -310,10 +310,6 @@ module.exports = (function() {
     }
   };
 
-  Query.prototype.isShowIndexesQuery = function () {
-    return this.sql.indexOf('pg_get_indexdef') !== -1;
-  };
-
   Query.prototype.isForeignKeysQuery = function() {
     return /SELECT conname as constraint_name, pg_catalog\.pg_get_constraintdef\(r\.oid, true\) as condef FROM pg_catalog\.pg_constraint r WHERE r\.conrelid = \(SELECT oid FROM pg_class WHERE relname = '.*' LIMIT 1\) AND r\.contype = 'f' ORDER BY 1;/.test(this.sql);
   };

lib/dialects/sqlite/query-generator.js

@@ -323,7 +323,7 @@ module.exports = (function() {
       return fields;
     },
 
-    showIndexQuery: function(tableName) {
+    showIndexesQuery: function(tableName) {
       var sql = "PRAGMA INDEX_LIST(<%= tableName %>)";
       return Utils._.template(sql, { tableName: this.quoteTable(tableName) });
     },

lib/query-interface.js

@@ -420,9 +420,12 @@ module.exports = (function() {
   };
 
   QueryInterface.prototype.showIndex = function(tableName, options) {
-    var sql = this.QueryGenerator.showIndexQuery(tableName, options);
+    var sql = this.QueryGenerator.showIndexesQuery(tableName, options);
     options = options || {};
-    return this.sequelize.query(sql, null, {logging: options.hasOwnProperty('logging') ? options.logging : this.sequelize.options.logging});
+    return this.sequelize.query(sql, null, {
+      logging: options.hasOwnProperty('logging') ? options.logging : this.sequelize.options.logging,
+      type: QueryTypes.SHOWINDEXES
+    });
   };
 
   QueryInterface.prototype.nameIndexes = function(indexes, rawTablename) {

lib/query-types.js

@@ -7,5 +7,6 @@ module.exports = {
   BULKDELETE: 'BULKDELETE',
   UPSERT: 'UPSERT',
   VERSION: 'VERSION',
-  SHOWTABLES: 'SHOWTABLES'
+  SHOWTABLES: 'SHOWTABLES',
+  SHOWINDEXES: 'SHOWINDEXES'
 };

test/dialects/mysql/query-generator.test.js

@@ -543,7 +543,7 @@ if (Support.dialectIsMySQL()) {
         }
       ],
 
-      showIndexQuery: [
+      showIndexesQuery: [
         {
           arguments: ['User'],
           expectation: 'SHOW INDEX FROM `User`'