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From amansinha100 <...@git.apache.org>
Subject [GitHub] drill pull request: Drill 4372 review
Date Wed, 02 Mar 2016 07:50:36 GMT
Github user amansinha100 commented on a diff in the pull request:

    https://github.com/apache/drill/pull/397#discussion_r54689413
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/expr/fn/DrillFunctionRegistry.java
---
    @@ -92,38 +94,110 @@ 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 Collection<DrillFuncHolder> getAllMethods() {
    +    return Collections.unmodifiableCollection(registeredFunctions.values());
       }
     
       public void register(DrillOperatorTable operatorTable) {
    -    SqlOperator op;
    -    for (Entry<String, Collection<DrillFuncHolder>> function : methods.asMap().entrySet())
{
    -      Set<Integer> argCounts = Sets.newHashSet();
    -      String name = function.getKey().toUpperCase();
    +    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()) {
    -        if (argCounts.add(func.getParamCount())) {
    -          if (func.isAggregating()) {
    -            op = new DrillSqlAggOperator(name, func.getParamCount());
    -          } else {
    -            boolean isDeterministic;
    -            // prevent Drill from folding constant functions with types that cannot be
materialized
    -            // into literals
    -            if (DrillConstExecutor.NON_REDUCIBLE_TYPES.contains(func.getReturnType().getMinorType()))
{
    -              isDeterministic = false;
    -            } else {
    -              isDeterministic = func.isDeterministic();
    -            }
    -            op = new DrillSqlOperator(name, func.getParamCount(), func.getReturnType(),
isDeterministic);
    -          }
    -          operatorTable.add(function.getKey(), op);
    +        final int paramCount = func.getParamCount();
    +        if(func.isAggregating()) {
    +          aggregateFunctions.put(paramCount, func);
    +        } else {
    +          final Pair<Integer, Integer> argNumerRange = getArgNumerRange(name, func);
    +          functions.put(argNumerRange, func);
             }
    +
    +        if(!func.isDeterministic()) {
    +          isDeterministic = false;
    +        }
    +      }
    +      for (Entry<Pair<Integer, Integer>, Collection<DrillFuncHolder>>
entry : functions.asMap().entrySet()) {
    +        final DrillSqlOperator drillSqlOperator;
    +        final Pair<Integer, Integer> range = entry.getKey();
    +        final int max = range.getRight();
    +        final int min = range.getLeft();
    +        drillSqlOperator = new DrillSqlOperator(
    +            name,
    +            Lists.newArrayList(entry.getValue()),
    +            min,
    +            max,
    +            isDeterministic);
    +        operatorTable.add(name, drillSqlOperator);
    +      }
    +      for (Entry<Integer, Collection<DrillFuncHolder>> entry : aggregateFunctions.asMap().entrySet())
{
    +        operatorTable.add(name, new DrillSqlAggOperator(name, Lists.newArrayList(entry.getValue()),
entry.getKey()));
           }
         }
    +
    +    registerCalcitePlaceHolderFunction(operatorTable);
    +  }
    +
    +  /**
    +   * These {@link DrillSqlOperator} merely act as a placeholder so that Calcite
    +   * allows convert_to(), convert_from(), flatten(), date_part() functions in SQL.
    +   */
    +  private void registerCalcitePlaceHolderFunction(DrillOperatorTable operatorTable) {
    +    final String convert_to = "CONVERT_TO";
    +    final String convert_from = "CONVERT_FROM";
    +    final String flatten = "FLATTEN";
    +    final String date_part = "DATE_PART";
    +
    +    operatorTable.add(convert_to,
    +        new DrillSqlOperator(convert_to,
    +            2,
    +            true));
    +    operatorTable.add(convert_from,
    +        new DrillSqlOperator(convert_from,
    +            2,
    +            true));
    +    operatorTable.add(flatten,
    +        new DrillSqlOperator(flatten,
    +            1,
    +            true));
    +    operatorTable.add(date_part,
    +        new DrillSqlOperator(date_part,
    +            2,
    +            true));
       }
     
    +  private Pair<Integer, Integer> getArgNumerRange(final String name, final DrillFuncHolder
func) {
    +    switch(name.toUpperCase()) {
    +      case "CONCAT":
    --- End diff --
    
    Similar to the previous comment, it would be preferable to not have switch statements
with lots of cases (the number of such functions that need to be handled here could keep growing).
 


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