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https://issues.apache.org/jira/browse/DRILL-3988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16645623#comment-16645623
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ASF GitHub Bot commented on DRILL-3988:
---------------------------------------
kkhatua commented on a change in pull request #1483: DRILL-3988: Expose Drill
built-in functions & UDFs in a system table
URL: https://github.com/apache/drill/pull/1483#discussion_r224259705
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/expr/fn/registry/FunctionRegistryHolder.java
##########
@@ -161,6 +163,38 @@ public void removeJar(String jarName) {
}
}
+ /**
+ * Retrieves all functions (holders) associated with all the jars
+ * This is read operation, so several users can perform this operation at
the same time.
+ * @return list of all functions, mapped by their sources
+ */
+ public Map<String, List<FunctionHolder>> getAllJarsWithFunctionHolders() {
+ Map<String, List<FunctionHolder>> allFunctionHoldersByJar = new
HashMap<>();
+
+ try (@SuppressWarnings("unused") Closeable lock = readLock.open()) {
+ for (String jarName : jars.keySet()) {
+ //Capture functionHolders here
+ List<FunctionHolder> drillFuncHolderList = new LinkedList<>();
Review comment:
Since the variable is only used to add and remove the function holders, this
seemed most efficient for memory and speed. Some sources (like `built-in`) will
have 2K+ functions, while UDFs will have as little as 1 function.
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> Create a sys.functions table to expose available Drill functions
> ----------------------------------------------------------------
>
> Key: DRILL-3988
> URL: https://issues.apache.org/jira/browse/DRILL-3988
> Project: Apache Drill
> Issue Type: Sub-task
> Components: Metadata
> Reporter: Jacques Nadeau
> Assignee: Kunal Khatua
> Priority: Major
> Labels: doc-impacting
> Fix For: 1.15.0
>
>
> Create a new sys.functions table that returns a list of all available
> functions.
> Key considerations:
> - one row per name or one per argument set. I'm inclined to latter so people
> can use queries to get to data.
> - we need to create a delineation between user functions and internal
> functions and only show user functions. 'CastInt' isn't something the user
> should be able to see (or run).
> - should we add a description annotation that could be included in the
> sys.functions table?
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