use of com.facebook.presto.spi.relation.DomainTranslator.BASIC_COLUMN_EXTRACTOR in project presto by prestodb.
the class PickTableLayout method pushPredicateIntoTableScan.
/**
* For RowExpression {@param predicate}
*/
private static PlanNode pushPredicateIntoTableScan(TableScanNode node, RowExpression predicate, boolean pruneWithPredicateExpression, Session session, PlanNodeIdAllocator idAllocator, Metadata metadata, DomainTranslator domainTranslator) {
// don't include non-deterministic predicates
LogicalRowExpressions logicalRowExpressions = new LogicalRowExpressions(new RowExpressionDeterminismEvaluator(metadata.getFunctionAndTypeManager()), new FunctionResolution(metadata.getFunctionAndTypeManager()), metadata.getFunctionAndTypeManager());
RowExpression deterministicPredicate = logicalRowExpressions.filterDeterministicConjuncts(predicate);
DomainTranslator.ExtractionResult<VariableReferenceExpression> decomposedPredicate = domainTranslator.fromPredicate(session.toConnectorSession(), deterministicPredicate, BASIC_COLUMN_EXTRACTOR);
TupleDomain<ColumnHandle> newDomain = decomposedPredicate.getTupleDomain().transform(variableName -> node.getAssignments().get(variableName)).intersect(node.getEnforcedConstraint());
Map<ColumnHandle, VariableReferenceExpression> assignments = ImmutableBiMap.copyOf(node.getAssignments()).inverse();
Constraint<ColumnHandle> constraint;
if (pruneWithPredicateExpression) {
LayoutConstraintEvaluatorForRowExpression evaluator = new LayoutConstraintEvaluatorForRowExpression(metadata, session, node.getAssignments(), logicalRowExpressions.combineConjuncts(deterministicPredicate, // which would be expensive to evaluate in the call to isCandidate below.
domainTranslator.toPredicate(newDomain.simplify().transform(column -> assignments.getOrDefault(column, null)))));
constraint = new Constraint<>(newDomain, evaluator::isCandidate);
} else {
// Currently, invoking the expression interpreter is very expensive.
// TODO invoke the interpreter unconditionally when the interpreter becomes cheap enough.
constraint = new Constraint<>(newDomain);
}
if (constraint.getSummary().isNone()) {
return new ValuesNode(node.getSourceLocation(), idAllocator.getNextId(), node.getOutputVariables(), ImmutableList.of());
}
// Layouts will be returned in order of the connector's preference
TableLayoutResult layout = metadata.getLayout(session, node.getTable(), constraint, Optional.of(node.getOutputVariables().stream().map(variable -> node.getAssignments().get(variable)).collect(toImmutableSet())));
if (layout.getLayout().getPredicate().isNone()) {
return new ValuesNode(node.getSourceLocation(), idAllocator.getNextId(), node.getOutputVariables(), ImmutableList.of());
}
TableScanNode tableScan = new TableScanNode(node.getSourceLocation(), node.getId(), layout.getLayout().getNewTableHandle(), node.getOutputVariables(), node.getAssignments(), layout.getLayout().getPredicate(), computeEnforced(newDomain, layout.getUnenforcedConstraint()));
// The order of the arguments to combineConjuncts matters:
// * Unenforced constraints go first because they can only be simple column references,
// which are not prone to logic errors such as out-of-bound access, div-by-zero, etc.
// * Conjuncts in non-deterministic expressions and non-TupleDomain-expressible expressions should
// retain their original (maybe intermixed) order from the input predicate. However, this is not implemented yet.
// * Short of implementing the previous bullet point, the current order of non-deterministic expressions
// and non-TupleDomain-expressible expressions should be retained. Changing the order can lead
// to failures of previously successful queries.
RowExpression resultingPredicate = logicalRowExpressions.combineConjuncts(domainTranslator.toPredicate(layout.getUnenforcedConstraint().transform(assignments::get)), logicalRowExpressions.filterNonDeterministicConjuncts(predicate), decomposedPredicate.getRemainingExpression());
if (!TRUE_CONSTANT.equals(resultingPredicate)) {
return new FilterNode(node.getSourceLocation(), idAllocator.getNextId(), tableScan, resultingPredicate);
}
return tableScan;
}
use of com.facebook.presto.spi.relation.DomainTranslator.BASIC_COLUMN_EXTRACTOR in project presto by prestodb.
the class MaterializedViewQueryOptimizer method visitQuerySpecification.
@Override
protected Node visitQuerySpecification(QuerySpecification node, Void context) {
if (!node.getFrom().isPresent()) {
throw new IllegalStateException("Query with no From clause is not rewritable by materialized view");
}
Relation relation = node.getFrom().get();
if (relation instanceof AliasedRelation) {
removablePrefix = Optional.of(((AliasedRelation) relation).getAlias());
relation = ((AliasedRelation) relation).getRelation();
}
if (!(relation instanceof Table)) {
throw new SemanticException(NOT_SUPPORTED, node, "Relation other than Table is not supported in query optimizer");
}
Table baseTable = (Table) relation;
if (!removablePrefix.isPresent()) {
removablePrefix = Optional.of(new Identifier(baseTable.getName().toString()));
}
if (node.getGroupBy().isPresent()) {
ImmutableSet.Builder<Expression> expressionsInGroupByBuilder = ImmutableSet.builder();
for (GroupingElement element : node.getGroupBy().get().getGroupingElements()) {
element = removeGroupingElementPrefix(element, removablePrefix);
Optional<Set<Expression>> groupByOfMaterializedView = materializedViewInfo.getGroupBy();
if (groupByOfMaterializedView.isPresent()) {
for (Expression expression : element.getExpressions()) {
if (!groupByOfMaterializedView.get().contains(expression) || !materializedViewInfo.getBaseToViewColumnMap().containsKey(expression)) {
throw new IllegalStateException(format("Grouping element %s is not present in materialized view groupBy field", element));
}
}
}
expressionsInGroupByBuilder.addAll(element.getExpressions());
}
expressionsInGroupBy = Optional.of(expressionsInGroupByBuilder.build());
}
// TODO: Add HAVING validation to the validator https://github.com/prestodb/presto/issues/16406
if (node.getHaving().isPresent()) {
throw new SemanticException(NOT_SUPPORTED, node, "Having clause is not supported in query optimizer");
}
if (materializedViewInfo.getWhereClause().isPresent()) {
if (!node.getWhere().isPresent()) {
throw new IllegalStateException("Query with no where clause is not rewritable by materialized view with where clause");
}
QualifiedObjectName baseTableName = createQualifiedObjectName(session, baseTable, baseTable.getName());
Optional<TableHandle> tableHandle = metadata.getTableHandle(session, baseTableName);
if (!tableHandle.isPresent()) {
throw new SemanticException(MISSING_TABLE, node, "Table does not exist");
}
ImmutableList.Builder<Field> fields = ImmutableList.builder();
for (ColumnHandle columnHandle : metadata.getColumnHandles(session, tableHandle.get()).values()) {
ColumnMetadata columnMetadata = metadata.getColumnMetadata(session, tableHandle.get(), columnHandle);
fields.add(Field.newUnqualified(materializedViewInfo.getWhereClause().get().getLocation(), columnMetadata.getName(), columnMetadata.getType()));
}
Scope scope = Scope.builder().withRelationType(RelationId.anonymous(), new RelationType(fields.build())).build();
// Given base query's filter condition and materialized view's filter condition, the goal is to check if MV's filters contain Base's filters (Base implies MV).
// Let base query's filter condition be A, and MV's filter condition be B.
// One way to evaluate A implies B is to evaluate logical expression A^~B and check if the output domain is none.
// If the resulting domain is none, then A^~B is false. Thus A implies B.
// For more information and examples: https://fb.quip.com/WwmxA40jLMxR
// TODO: Implement method that utilizes external SAT solver libraries. https://github.com/prestodb/presto/issues/16536
RowExpression materializedViewWhereCondition = convertToRowExpression(materializedViewInfo.getWhereClause().get(), scope);
RowExpression baseQueryWhereCondition = convertToRowExpression(node.getWhere().get(), scope);
RowExpression rewriteLogicExpression = and(baseQueryWhereCondition, call(baseQueryWhereCondition.getSourceLocation(), "not", new FunctionResolution(metadata.getFunctionAndTypeManager()).notFunction(), materializedViewWhereCondition.getType(), materializedViewWhereCondition));
RowExpression disjunctiveNormalForm = logicalRowExpressions.convertToDisjunctiveNormalForm(rewriteLogicExpression);
ExtractionResult<VariableReferenceExpression> result = domainTranslator.fromPredicate(session.toConnectorSession(), disjunctiveNormalForm, BASIC_COLUMN_EXTRACTOR);
if (!result.getTupleDomain().equals(TupleDomain.none())) {
throw new IllegalStateException("View filter condition does not contain base query's filter condition");
}
}
return new QuerySpecification((Select) process(node.getSelect(), context), node.getFrom().map(from -> (Relation) process(from, context)), node.getWhere().map(where -> (Expression) process(where, context)), node.getGroupBy().map(groupBy -> (GroupBy) process(groupBy, context)), node.getHaving().map(having -> (Expression) process(having, context)), node.getOrderBy().map(orderBy -> (OrderBy) process(orderBy, context)), node.getOffset(), node.getLimit());
}
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