jnturton commented on a change in pull request #2388:
URL: https://github.com/apache/drill/pull/2388#discussion_r781226257



##########
File path: 
exec/java-exec/src/main/java/org/apache/drill/exec/store/SchemaTreeProvider.java
##########
@@ -154,17 +156,23 @@ public SchemaPlus createFullRootSchema(SchemaConfig 
schemaConfig) {
           .build(logger);
     }
   }
+  */
 
   @Override
   public void close() throws Exception {
+    //TODO jnturton: clean up
+    /*
     List<AutoCloseable> toClose = Lists.newArrayList();
     for(SchemaPlus tree : schemaTreesToClose) {
       addSchemasToCloseList(tree, toClose);
     }
 
     AutoCloseables.close(toClose);
+    */
   }
 
+  //TODO jnturton: clean up
+  /*
   private static void addSchemasToCloseList(final SchemaPlus tree, final 
List<AutoCloseable> toClose) {
     for(String subSchemaName : tree.getSubSchemaNames()) {
       addSchemasToCloseList(tree.getSubSchema(subSchemaName), toClose);

Review comment:
       @vvysotskyi under this PR, the construction of the schema tree becomes 
lazy since createFullRootSchema is avoided.  The code at this line 
unfortunately undoes the benefits by eagerly constructing the entire schema 
tree only in order to be able to close schema objects.  I am not happy about 
skipping calls to `close()` on schemas, do you think I should look to add code 
to DynamicRootSchemas that returns only schemas that have already been 
constructed and initialised so that the code here has a suitable collection to 
close?  E.g. the `getSubSchemaNames()`, which returns every storage config 
name, gets replaced with something like `getInitialisedSubSchemas()`?




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