feat(mssql/describeTable): include auto increment flag (#9171)

lib/dialects/mssql/query-generator.js

@@ -157,7 +157,8 @@ const QueryGenerator = {
       "c.CHARACTER_MAXIMUM_LENGTH AS 'Length',",
       "c.IS_NULLABLE as 'IsNull',",
       "COLUMN_DEFAULT AS 'Default',",
-      "pk.CONSTRAINT_TYPE AS 'Constraint'",
+      "pk.CONSTRAINT_TYPE AS 'Constraint',",
+      "COLUMNPROPERTY(OBJECT_ID(c.TABLE_SCHEMA+'.'+c.TABLE_NAME), c.COLUMN_NAME, 'IsIdentity') as 'IsIdentity'",
       'FROM',
       'INFORMATION_SCHEMA.TABLES t',
       'INNER JOIN',

lib/dialects/mssql/query.js

@@ -205,7 +205,8 @@ class Query extends AbstractQuery {
           type: _result.Type.toUpperCase(),
           allowNull: _result.IsNull === 'YES' ? true : false,
           defaultValue: _result.Default,
-          primaryKey: _result.Constraint === 'PRIMARY KEY'
+          primaryKey: _result.Constraint === 'PRIMARY KEY',
+          autoIncrement: _result.IsIdentity === 1
         };
       }
     } else if (this.isShowIndexesQuery()) {