RelAlgDagBuilder Class Reference

#include <RelAlgDagBuilder.h>

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Public Member Functions
	RelAlgDagBuilder ()=delete
	RelAlgDagBuilder (const std::string &query_ra, const Catalog_Namespace::Catalog &cat, const RenderInfo *render_info)
	RelAlgDagBuilder (RelAlgDagBuilder &root_dag_builder, const rapidjson::Value &query_ast, const Catalog_Namespace::Catalog &cat, const RenderInfo *render_opts)
const RelAlgNode &	getRootNode () const
std::shared_ptr< const RelAlgNode >	getRootNodeShPtr () const
void	registerSubquery (std::shared_ptr< RexSubQuery > subquery)
const std::vector < std::shared_ptr< RexSubQuery > > &	getSubqueries () const
void	resetQueryExecutionState ()

Private Member Functions
void	build (const rapidjson::Value &query_ast, RelAlgDagBuilder &root_dag_builder)

Private Attributes
const Catalog_Namespace::Catalog &	cat_
std::vector< std::shared_ptr < RelAlgNode > >	nodes_
std::vector< std::shared_ptr < RexSubQuery > >	subqueries_
const RenderInfo *	render_info_

Detailed Description

Builder class to create an in-memory, easy-to-navigate relational algebra DAG interpreted from a JSON representation from Calcite. Also, applies high level optimizations which can be expressed through relational algebra extended with RelCompound. The RelCompound node is an equivalent representation for sequences of RelFilter, RelProject and RelAggregate nodes. This coalescing minimizes the amount of intermediate buffers required to evaluate a query. Lower level optimizations are taken care by lower levels, mainly RelAlgTranslator and the IR code generation.

Definition at line 1490 of file RelAlgDagBuilder.h.

Constructor & Destructor Documentation

RelAlgDagBuilder::RelAlgDagBuilder ( )

delete

RelAlgDagBuilder::RelAlgDagBuilder	(	const std::string &	query_ra,
		const Catalog_Namespace::Catalog &	cat,
		const RenderInfo *	render_info
	)

Constructs a RelAlg DAG from a JSON representation.

Parameters

query_ra	A JSON string representation of an RA tree from Calcite.
cat	DB catalog for the current user.
render_opts	Additional build options for render queries.

Definition at line 2117 of file RelAlgDagBuilder.cpp.

References build(), CHECK(), logger::ERROR, LOG, RelAlgNode::resetRelAlgFirstId(), and VLOG.

    : cat_(cat), render_info_(render_info) {
  rapidjson::Document query_ast;
  query_ast.Parse(query_ra.c_str());
  if (query_ast.HasParseError()) {
    query_ast.GetParseError();
    LOG(ERROR) << "Failed to parse RA tree from Calcite (offset "
               << query_ast.GetErrorOffset() << "):\n"
               << rapidjson::GetParseError_En(query_ast.GetParseError());
    VLOG(1) << "Failed to parse query RA: " << query_ra;
    throw std::runtime_error(
        "Failed to parse relational algebra tree. Possible query syntax error.");
  }
  CHECK(query_ast.IsObject());
  RelAlgNode::resetRelAlgFirstId();
  build(query_ast, *this);
}

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RelAlgDagBuilder::RelAlgDagBuilder	(	RelAlgDagBuilder &	root_dag_builder,
		const rapidjson::Value &	query_ast,
		const Catalog_Namespace::Catalog &	cat,
		const RenderInfo *	render_opts
	)

Constructs a sub-DAG for any subqueries. Should only be called during DAG building.

Parameters

root_dag_builder	The root DAG builder. The root stores pointers to all subqueries.
query_ast	The current JSON node to build a DAG for.
cat	DB catalog for the current user.
render_opts	Additional build options for render queries.

Definition at line 2137 of file RelAlgDagBuilder.cpp.

References build().

    : cat_(cat), render_info_(render_info) {
  build(query_ast, root_dag_builder);
}

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Member Function Documentation

void RelAlgDagBuilder::build ( const rapidjson::Value &  query_ast, RelAlgDagBuilder &  root_dag_builder  )

private

Definition at line 2145 of file RelAlgDagBuilder.cpp.

References alterRAForRender(), anonymous_namespace{RelAlgDagBuilder.cpp}::bind_inputs(), cat_, CHECK(), anonymous_namespace{RelAlgDagBuilder.cpp}::coalesce_nodes(), anonymous_namespace{RelLeftDeepInnerJoin.cpp}::create_left_deep_join(), eliminate_dead_columns(), eliminate_identical_copy(), field(), fold_filters(), get_left_deep_join_root(), hoist_filter_cond_to_cross_join(), anonymous_namespace{RelAlgDagBuilder.cpp}::mark_nops(), nodes_, render_info_, details::RelAlgDispatcher::run(), anonymous_namespace{RelAlgDagBuilder.cpp}::separate_window_function_expressions(), simplify_sort(), and sink_projected_boolean_expr_to_join().

Referenced by RelAlgDagBuilder().

                                                                 {
  const auto& rels = field(query_ast, "rels");
  CHECK(rels.IsArray());
  try {
    nodes_ = details::RelAlgDispatcher(cat_).run(rels, lead_dag_builder);
  } catch (const QueryNotSupported&) {
    throw;
  }
  CHECK(!nodes_.empty());
  bind_inputs(nodes_);

  if (render_info_) {
    // Alter the RA for render. Do this before any flattening/optimizations are done to
    // the tree.
    alterRAForRender(nodes_, *render_info_);
  }

  mark_nops(nodes_);
  simplify_sort(nodes_);
  sink_projected_boolean_expr_to_join(nodes_);
  eliminate_identical_copy(nodes_);
  fold_filters(nodes_);
  std::vector<const RelAlgNode*> filtered_left_deep_joins;
  std::vector<const RelAlgNode*> left_deep_joins;
  for (const auto& node : nodes_) {
    const auto left_deep_join_root = get_left_deep_join_root(node);
    // The filter which starts a left-deep join pattern must not be coalesced
    // since it contains (part of) the join condition.
    if (left_deep_join_root) {
      left_deep_joins.push_back(left_deep_join_root.get());
      if (std::dynamic_pointer_cast<const RelFilter>(left_deep_join_root)) {
        filtered_left_deep_joins.push_back(left_deep_join_root.get());
      }
    }
  }
  if (filtered_left_deep_joins.empty()) {
    hoist_filter_cond_to_cross_join(nodes_);
  }
  eliminate_dead_columns(nodes_);
  separate_window_function_expressions(nodes_);
  coalesce_nodes(nodes_, left_deep_joins);
  CHECK(nodes_.back().unique());
  create_left_deep_join(nodes_);
}

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const RelAlgNode& RelAlgDagBuilder::getRootNode ( ) const

inline

Returns the root node of the DAG.

Definition at line 1521 of file RelAlgDagBuilder.h.

References CHECK().

                                        {
    CHECK(nodes_.size());
    const auto& last_ptr = nodes_.back();
    CHECK(last_ptr);
    return *last_ptr;
  }

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std::shared_ptr<const RelAlgNode> RelAlgDagBuilder::getRootNodeShPtr ( ) const

inline

Definition at line 1528 of file RelAlgDagBuilder.h.

References CHECK().

Referenced by anonymous_namespace{RelAlgDagBuilder.cpp}::parse_subquery().

                                                           {
    CHECK(nodes_.size());
    return nodes_.back();
  }

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const std::vector<std::shared_ptr<RexSubQuery> >& RelAlgDagBuilder::getSubqueries ( ) const

inline

Gets all registered subqueries. Only the root DAG can contain subqueries.

Definition at line 1544 of file RelAlgDagBuilder.h.

                                                                     {
    return subqueries_;
  }

void RelAlgDagBuilder::registerSubquery ( std::shared_ptr< RexSubQuery >  subquery )

inline

Registers a subquery with a root DAG builder. Should only be called during DAG building and registration should only occur on the root.

Definition at line 1537 of file RelAlgDagBuilder.h.

Referenced by anonymous_namespace{RelAlgDagBuilder.cpp}::parse_subquery().

                                                             {
    subqueries_.push_back(subquery);
  }

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void RelAlgDagBuilder::resetQueryExecutionState

(

)

Gets all registered subqueries. Only the root DAG can contain subqueries.

Definition at line 2191 of file RelAlgDagBuilder.cpp.

References nodes_.

                                                {
  for (auto& node : nodes_) {
    if (node) {
      node->resetQueryExecutionState();
    }
  }
}

Member Data Documentation

const Catalog_Namespace::Catalog& RelAlgDagBuilder::cat_

private

Definition at line 1556 of file RelAlgDagBuilder.h.

Referenced by build().

std::vector<std::shared_ptr<RelAlgNode> > RelAlgDagBuilder::nodes_

private

Definition at line 1557 of file RelAlgDagBuilder.h.

Referenced by build(), and resetQueryExecutionState().

const RenderInfo* RelAlgDagBuilder::render_info_

private

Definition at line 1559 of file RelAlgDagBuilder.h.

Referenced by build().

std::vector<std::shared_ptr<RexSubQuery> > RelAlgDagBuilder::subqueries_

private

Definition at line 1558 of file RelAlgDagBuilder.h.

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The documentation for this class was generated from the following files:

• /home/jenkins-slave/workspace/core-os-doxygen/QueryEngine/RelAlgDagBuilder.h
• /home/jenkins-slave/workspace/core-os-doxygen/QueryEngine/RelAlgDagBuilder.cpp