Examples with VisitParentExpressionVisitor io.confluent.ksql.execution.expression.tree.VisitParentExpressionVisitor used on opensource projects

Example 1 with VisitParentExpressionVisitor

use of io.confluent.ksql.execution.expression.tree.VisitParentExpressionVisitor in project ksql by confluentinc.

the class LogicalPlanner method verifyForeignKeyJoin.

private Optional<Expression> verifyForeignKeyJoin(final JoinInfo joinInfo, final PlanNode leftNode, final PlanNode rightNode) {
    final JoinType joinType = joinInfo.getType();
    final Expression leftExpression = joinInfo.getLeftJoinExpression();
    final Expression rightExpression = joinInfo.getRightJoinExpression();
    if (joinInfo.getType().equals(JoinType.OUTER)) {
        throw new KsqlException(String.format("Invalid join type:" + " full-outer join not supported for foreign-key table-table join." + " Got %s %s %s.", joinInfo.getLeftSource().getDataSource().getName().text(), joinType, joinInfo.getRightSource().getDataSource().getName().text()));
    }
    // because a FK-join output table has the same PK as its left input table
    if (!(leftNode instanceof DataSourceNode) || !(rightNode instanceof DataSourceNode)) {
        throw new KsqlException(String.format("Invalid join condition:" + " foreign-key table-table joins are not supported as part of n-way joins." + " Got %s = %s.", joinInfo.getFlippedLeftJoinExpression(), joinInfo.getFlippedRightJoinExpression()));
    }
    final CodeGenRunner codeGenRunner = new CodeGenRunner(leftNode.getSchema(), ksqlConfig, metaStore);
    final VisitParentExpressionVisitor<Optional<Expression>, Context<Void>> unqualifiedRewritter = new VisitParentExpressionVisitor<Optional<Expression>, Context<Void>>(Optional.empty()) {

        @Override
        public Optional<Expression> visitQualifiedColumnReference(final QualifiedColumnReferenceExp node, final Context<Void> ctx) {
            return Optional.of(new UnqualifiedColumnReferenceExp(node.getColumnName()));
        }
    };
    final Expression leftExpressionUnqualified = ExpressionTreeRewriter.rewriteWith(unqualifiedRewritter::process, leftExpression);
    final ExpressionEvaluator expressionEvaluator = codeGenRunner.buildCodeGenFromParseTree(leftExpressionUnqualified, "Left Join Expression");
    final SqlType fkType = expressionEvaluator.getExpressionType();
    final SqlType rightKeyType = Iterables.getOnlyElement(rightNode.getSchema().key()).type();
    verifyJoinConditionTypes(fkType, rightKeyType, leftExpression, rightExpression, joinInfo.hasFlippedJoinCondition());
    if (((DataSourceNode) rightNode).isWindowed()) {
        throw new KsqlException("Foreign-key table-table joins are not supported on windowed tables.");
    }
    return Optional.of(leftExpression);
}

Example 2 with VisitParentExpressionVisitor

use of io.confluent.ksql.execution.expression.tree.VisitParentExpressionVisitor in project ksql by confluentinc.

the class LogicalPlanner method prepareSourceForJoin.

private PlanNode prepareSourceForJoin(final DataSourceNode sourceNode, final String side, final Expression joinExpression, final boolean isForeignKeyJoin) {
    final PlanNode preProjectNode;
    if (isForeignKeyJoin) {
        // we do not need to repartition for foreign key joins, as FK joins do not
        // have co-partitioning requirements
        preProjectNode = sourceNode;
    } else {
        // it is always safe to build the repartition node - this operation will be
        // a no-op if a repartition is not required. if the source is a table, and
        // a repartition is needed, then an exception will be thrown
        final VisitParentExpressionVisitor<Optional<Expression>, Context<Void>> rewriter = new VisitParentExpressionVisitor<Optional<Expression>, Context<Void>>(Optional.empty()) {

            @Override
            public Optional<Expression> visitQualifiedColumnReference(final QualifiedColumnReferenceExp node, final Context<Void> ctx) {
                return Optional.of(new UnqualifiedColumnReferenceExp(node.getColumnName()));
            }
        };
        preProjectNode = buildInternalRepartitionNode(sourceNode, side, joinExpression, rewriter::process);
    }
    return buildInternalProjectNode(preProjectNode, "PrependAlias" + side, sourceNode.getAlias());
}

Example 3 with VisitParentExpressionVisitor

use of io.confluent.ksql.execution.expression.tree.VisitParentExpressionVisitor in project ksql by confluentinc.

the class LogicalPlanner method buildForeignJoinKey.

private JoinKey buildForeignJoinKey(final Join join, final Expression foreignKeyExpression) {
    final AliasedDataSource leftSource = join.getInfo().getLeftSource();
    final SourceName alias = leftSource.getAlias();
    final List<QualifiedColumnReferenceExp> leftSourceKeys = leftSource.getDataSource().getSchema().key().stream().map(c -> new QualifiedColumnReferenceExp(alias, c.name())).collect(Collectors.toList());
    final VisitParentExpressionVisitor<Optional<Expression>, Context<Void>> aliasRewritter = new VisitParentExpressionVisitor<Optional<Expression>, Context<Void>>(Optional.empty()) {

        @Override
        public Optional<Expression> visitQualifiedColumnReference(final QualifiedColumnReferenceExp node, final Context<Void> ctx) {
            return Optional.of(new UnqualifiedColumnReferenceExp(ColumnNames.generatedJoinColumnAlias(node.getQualifier(), node.getColumnName())));
        }
    };
    final Expression aliasedForeignKeyExpression = ExpressionTreeRewriter.rewriteWith(aliasRewritter::process, foreignKeyExpression);
    return JoinKey.foreignKey(aliasedForeignKeyExpression, leftSourceKeys);
}