Github user sudheeshkatkam commented on a diff in the pull request: https://github.com/apache/drill/pull/397#discussion_r56431206 --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/expr/fn/DrillFunctionRegistry.java --- @@ -92,23 +118,106 @@ public DrillFunctionRegistry(ScanResult classpathScan) { } public int size(){ - return methods.size(); + return registeredFunctions.size(); } /** Returns functions with given name. Function name is case insensitive. */ public List<DrillFuncHolder> getMethods(String name) { - return this.methods.get(name.toLowerCase()); + return this.registeredFunctions.get(name.toLowerCase()); } public void register(DrillOperatorTable operatorTable) { + registerForInference(operatorTable); + registerForDefault(operatorTable); + } + + public void registerForInference(DrillOperatorTable operatorTable) { + final Map<String, DrillSqlOperator.DrillSqlOperatorBuilder> map = Maps.newHashMap(); + final Map<String, DrillSqlAggOperator.DrillSqlAggOperatorBuilder> mapAgg = Maps.newHashMap(); + for (Entry<String, Collection<DrillFuncHolder>> function : registeredFunctions.asMap().entrySet()) { + final ArrayListMultimap<Pair<Integer, Integer>, DrillFuncHolder> functions = ArrayListMultimap.create(); + final ArrayListMultimap<Integer, DrillFuncHolder> aggregateFunctions = ArrayListMultimap.create(); + final String name = function.getKey().toUpperCase(); + boolean isDeterministic = true; + for (DrillFuncHolder func : function.getValue()) { + final int paramCount = func.getParamCount(); + if(func.isAggregating()) { + aggregateFunctions.put(paramCount, func); + } else { + final Pair<Integer, Integer> argNumberRange; + if(drillFuncToRange.containsKey(name)) { + argNumberRange = drillFuncToRange.get(name); + } else { + argNumberRange = Pair.of(func.getParamCount(), func.getParamCount()); + } + functions.put(argNumberRange, func); + } + + if(!func.isDeterministic()) { + isDeterministic = false; + } + } + for (Entry<Pair<Integer, Integer>, Collection<DrillFuncHolder>> entry : functions.asMap().entrySet()) { + final Pair<Integer, Integer> range = entry.getKey(); + final int max = range.getRight(); + final int min = range.getLeft(); + if(map.containsKey(name)) { --- End diff -- Nit: simplify if..else ```java if (!map.containsKey(name) ) { map.put(name, new DrillSqlOperator.DrillSqlOperatorBuilder().setName(name)); } map.get(name)...; ```
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