Examples with DrillCalciteSqlAggFunctionWrapper org.apache.drill.exec.planner.sql.DrillCalciteSqlAggFunctionWrapper used on opensource projects

Example 1 with DrillCalciteSqlAggFunctionWrapper

use of org.apache.drill.exec.planner.sql.DrillCalciteSqlAggFunctionWrapper in project drill by apache.

the class DrillReduceAggregatesRule method reduceSum.

private RexNode reduceSum(Aggregate oldAggRel, AggregateCall oldCall, List<AggregateCall> newCalls, Map<AggregateCall, RexNode> aggCallMapping) {
    final PlannerSettings plannerSettings = (PlannerSettings) oldAggRel.getCluster().getPlanner().getContext();
    final boolean isInferenceEnabled = plannerSettings.isTypeInferenceEnabled();
    final int nGroups = oldAggRel.getGroupCount();
    RelDataTypeFactory typeFactory = oldAggRel.getCluster().getTypeFactory();
    RexBuilder rexBuilder = oldAggRel.getCluster().getRexBuilder();
    int arg = oldCall.getArgList().get(0);
    RelDataType argType = getFieldType(oldAggRel.getInput(), arg);
    final RelDataType sumType;
    final SqlAggFunction sumZeroAgg;
    if (isInferenceEnabled) {
        sumType = oldCall.getType();
        sumZeroAgg = new DrillCalciteSqlAggFunctionWrapper(new SqlSumEmptyIsZeroAggFunction(), sumType);
    } else {
        sumType = typeFactory.createTypeWithNullability(argType, argType.isNullable());
        sumZeroAgg = new SqlSumEmptyIsZeroAggFunction();
    }
    AggregateCall sumZeroCall = AggregateCall.create(sumZeroAgg, oldCall.isDistinct(), oldCall.getArgList(), -1, sumType, null);
    final SqlCountAggFunction countAgg = (SqlCountAggFunction) SqlStdOperatorTable.COUNT;
    final RelDataType countType = countAgg.getReturnType(typeFactory);
    AggregateCall countCall = AggregateCall.create(countAgg, oldCall.isDistinct(), oldCall.getArgList(), -1, countType, null);
    // NOTE:  these references are with respect to the output
    // of newAggRel
    RexNode sumZeroRef = rexBuilder.addAggCall(sumZeroCall, nGroups, oldAggRel.indicator, newCalls, aggCallMapping, ImmutableList.of(argType));
    if (!oldCall.getType().isNullable()) {
        // null). Therefore we translate to SUM0(x).
        return sumZeroRef;
    }
    RexNode countRef = rexBuilder.addAggCall(countCall, nGroups, oldAggRel.indicator, newCalls, aggCallMapping, ImmutableList.of(argType));
    return rexBuilder.makeCall(SqlStdOperatorTable.CASE, rexBuilder.makeCall(SqlStdOperatorTable.EQUALS, countRef, rexBuilder.makeExactLiteral(BigDecimal.ZERO)), rexBuilder.constantNull(), sumZeroRef);
}