paul-rogers commented on a change in pull request #1997: DRILL-7604: Allow 
session options to be set in HTTP queries
URL: https://github.com/apache/drill/pull/1997#discussion_r384880410
 
 

 ##########
 File path: 
exec/java-exec/src/main/java/org/apache/drill/exec/server/rest/QueryResources.java
 ##########
 @@ -110,6 +117,47 @@ public Viewable submitQuery(@FormParam("query") String 
query,
     }
   }
 
+  private Map<String, Object> readOptionsFromForm(Form form) {
+    Map<String, Object> options = new HashMap<>();
+    SessionOptionManager sessionOptionManager = 
webUserConnection.getSession().getOptions();
+    for (Map.Entry<String, List<String>> pair : form.asMap().entrySet()) {
+      String name = pair.getKey();
+      OptionDefinition definition = 
sessionOptionManager.getOptionDefinition(name);
+      if (definition != null) {
+        String valueStr = pair.getValue().get(0);
+        if (!valueStr.isEmpty()) {
+          try {
+            Object value = null;
+            switch (definition.getValidator().getKind()) {
+              case BOOLEAN:
+                if ("true".equals(valueStr)) {
+                  value = true;
+                } else if ("false".equals(valueStr)) {
+                  value = false;
+                } else {
+                  throw new BadRequestException(String.format("Invalid boolean 
option value for %s: %s", name, valueStr));
+                }
+                break;
+              case DOUBLE:
+                value = Double.valueOf(valueStr);
+                break;
+              case STRING:
+                value = valueStr;
+                break;
+              case LONG:
+                value = Long.valueOf(valueStr);
+                break;
+            }
+            options.put(name, value);
 
 Review comment:
   `value` will be `null` here for an unknown type. Also, there is probably an 
IDE warning for missing `default` clause. Maybe add one that ignores (or logs) 
the "should never occur" case of an unknown option type.

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