Github user arina-ielchiieva commented on a diff in the pull request:
https://github.com/apache/drill/pull/701#discussion_r102921207
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/expr/fn/FunctionImplementationRegistry.java
---
@@ -140,27 +142,39 @@ public void register(DrillOperatorTable
operatorTable) {
}
/**
- * Using the given <code>functionResolver</code>
- * finds Drill function implementation for given
<code>functionCall</code>.
- * If function implementation was not found,
- * loads all missing remote functions and tries to find Drill
implementation one more time.
+ * First attempts to finds the Drill function implementation that
matches the name, arg types and return type.
+ * If exact function implementation was not found,
+ * syncs local function registry with remote function registry if needed
+ * and tries to find function implementation one more time
--- End diff --
As agreed, we'll gone leave this implementation till MVCC will be
implemented. MVCC will ensure we have up-to-date function registry before query
planning or execution stages.
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