Github user hsuanyi commented on a diff in the pull request:
https://github.com/apache/drill/pull/397#discussion_r54952798
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/expr/fn/DrillFunctionRegistry.java
---
@@ -17,40 +17,60 @@
*/
package org.apache.drill.exec.expr.fn;
-import java.util.Arrays;
import java.util.Collection;
+import java.util.Collections;
import java.util.HashMap;
-import java.util.HashSet;
import java.util.List;
+import java.util.Map;
import java.util.Map.Entry;
-import java.util.Set;
-import org.apache.calcite.sql.SqlOperator;
+import com.google.common.collect.Lists;
+import com.google.common.collect.Maps;
+import org.apache.commons.lang3.tuple.Pair;
import
org.apache.drill.common.scanner.persistence.AnnotatedClassDescriptor;
import org.apache.drill.common.scanner.persistence.ScanResult;
-import org.apache.drill.exec.expr.DrillFunc;
import org.apache.drill.exec.planner.logical.DrillConstExecutor;
import org.apache.drill.exec.planner.sql.DrillOperatorTable;
import org.apache.drill.exec.planner.sql.DrillSqlAggOperator;
import org.apache.drill.exec.planner.sql.DrillSqlOperator;
import com.google.common.collect.ArrayListMultimap;
-import com.google.common.collect.Sets;
+/**
+ * Registry of Drill functions.
+ */
public class DrillFunctionRegistry {
- static final org.slf4j.Logger logger =
org.slf4j.LoggerFactory.getLogger(DrillFunctionRegistry.class);
+ private static final org.slf4j.Logger logger =
org.slf4j.LoggerFactory.getLogger(DrillFunctionRegistry.class);
- private ArrayListMultimap<String, DrillFuncHolder> methods =
ArrayListMultimap.create();
+ // key: function name (lowercase) value: list of functions with that name
+ private final ArrayListMultimap<String, DrillFuncHolder>
registeredFunctions = ArrayListMultimap.create();
- /* Hash map to prevent registering functions with exactly matching
signatures
- * key: Function Name + Input's Major Type
- * Value: Class name where function is implemented
- */
- private HashMap<String, String> functionSignatureMap = new HashMap<>();
+ private static final Map<String, Pair<Integer, Integer>>
drillFuncToRange = Maps.newHashMap();
--- End diff --
addressed
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