[sql lab] deeper support for templating (#3996)

* [sql lab] deeper support for templating

* Fixing py tests

* Fix typo

superset/assets/javascripts/SqlLab/components/SqlEditor.jsx

@@ -15,6 +15,7 @@ import {
 import SplitPane from 'react-split-pane';
 
 import Button from '../../components/Button';
+import TemplateParamsEditor from './TemplateParamsEditor';
 import SouthPane from './SouthPane';
 import SaveQuery from './SaveQuery';
 import Timer from '../../components/Timer';
@@ -24,6 +25,7 @@ import { STATE_BSSTYLE_MAP } from '../constants';
 import RunQueryActionButton from './RunQueryActionButton';
 import { t } from '../../locales';
 
+
 const propTypes = {
   actions: PropTypes.object.isRequired,
   height: PropTypes.string.isRequired,
@@ -95,6 +97,7 @@ class SqlEditor extends React.PureComponent {
       tab: qe.title,
       schema: qe.schema,
       tempTableName: ctas ? this.state.ctas : '',
+      templateParams: qe.templateParams,
       runAsync,
       ctas,
     };
@@ -189,6 +192,13 @@ class SqlEditor extends React.PureComponent {
           </Form>
         </div>
         <div className="pull-right">
+          <TemplateParamsEditor
+            language="json"
+            onChange={(params) => {
+              this.props.actions.queryEditorSetTemplateParams(qe, params);
+            }}
+            code={qe.templateParams}
+          />
           {limitWarning}
           {this.props.latestQuery &&
             <Timer