Examples with TRUE_CONSTANT io.prestosql.expressions.LogicalRowExpressions.TRUE_CONSTANT used on opensource projects

Example 1 with TRUE_CONSTANT

use of io.prestosql.expressions.LogicalRowExpressions.TRUE_CONSTANT in project hetu-core by openlookeng.

the class TransformFilteringSemiJoinToInnerJoin method apply.

@Override
public Result apply(FilterNode filterNode, Captures captures, Context context) {
    SemiJoinNode semiJoin = captures.get(SEMI_JOIN);
    // Do no transform semi-join in context of DELETE
    if (PlanNodeSearcher.searchFrom(semiJoin.getSource(), context.getLookup()).where(node -> node instanceof TableScanNode && ((TableScanNode) node).isForDelete()).matches()) {
        return Result.empty();
    }
    Symbol semiJoinSymbol = semiJoin.getSemiJoinOutput();
    TypeProvider types = context.getSymbolAllocator().getTypes();
    Predicate<RowExpression> isSemiJoinSymbol = expression -> expression.equals(toVariableReference(semiJoinSymbol, types));
    LogicalRowExpressions logicalRowExpressions = new LogicalRowExpressions(new RowExpressionDeterminismEvaluator(metadata), new FunctionResolution(metadata.getFunctionAndTypeManager()), metadata.getFunctionAndTypeManager());
    List<RowExpression> conjuncts = LogicalRowExpressions.extractConjuncts(filterNode.getPredicate());
    if (conjuncts.stream().noneMatch(isSemiJoinSymbol)) {
        return Result.empty();
    }
    RowExpression filteredPredicate = LogicalRowExpressions.and(conjuncts.stream().filter(expression -> !expression.equals(toVariableReference(semiJoinSymbol, types))).collect(toImmutableList()));
    RowExpression simplifiedPredicate = inlineVariables(variable -> {
        if (variable.equals(toVariableReference(semiJoinSymbol, types))) {
            return TRUE_CONSTANT;
        }
        return variable;
    }, filteredPredicate);
    Optional<RowExpression> joinFilter = simplifiedPredicate.equals(TRUE_CONSTANT) ? Optional.empty() : Optional.of(simplifiedPredicate);
    PlanNode filteringSourceDistinct = new AggregationNode(context.getIdAllocator().getNextId(), semiJoin.getFilteringSource(), ImmutableMap.of(), singleGroupingSet(ImmutableList.of(semiJoin.getFilteringSourceJoinSymbol())), ImmutableList.of(), SINGLE, Optional.empty(), Optional.empty(), AggregationNode.AggregationType.HASH, Optional.empty());
    JoinNode innerJoin = new JoinNode(semiJoin.getId(), INNER, semiJoin.getSource(), filteringSourceDistinct, ImmutableList.of(new EquiJoinClause(semiJoin.getSourceJoinSymbol(), semiJoin.getFilteringSourceJoinSymbol())), semiJoin.getSource().getOutputSymbols(), joinFilter.isPresent() ? Optional.of(joinFilter.get()) : Optional.empty(), Optional.empty(), Optional.empty(), Optional.empty(), Optional.empty(), // TODO: dynamic filter from SemiJoinNode
    ImmutableMap.of());
    ProjectNode project = new ProjectNode(context.getIdAllocator().getNextId(), innerJoin, Assignments.builder().putAll(AssignmentUtils.identityAsSymbolReferences(innerJoin.getOutputSymbols())).put(semiJoinSymbol, TRUE_CONSTANT).build());
    return Result.ofPlanNode(project);
}