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330 lines
11 KiB
C++
330 lines
11 KiB
C++
#include <Storages/ConstraintsDescription.h>
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#include <Interpreters/ExpressionAnalyzer.h>
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#include <Interpreters/TreeRewriter.h>
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#include <Parsers/formatAST.h>
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#include <Parsers/ParserCreateQuery.h>
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#include <Parsers/parseQuery.h>
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#include <Parsers/ASTExpressionList.h>
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#include <Parsers/ASTFunction.h>
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#include <Core/Defines.h>
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#include <Analyzer/QueryTreeBuilder.h>
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#include <Analyzer/FunctionNode.h>
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#include <Analyzer/TableNode.h>
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#include <Analyzer/QueryNode.h>
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#include <Analyzer/Passes/QueryAnalysisPass.h>
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#include <Interpreters/Context.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int LOGICAL_ERROR;
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}
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String ConstraintsDescription::toString() const
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{
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if (constraints.empty())
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return {};
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ASTExpressionList list;
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for (const auto & constraint : constraints)
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list.children.push_back(constraint);
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return serializeAST(list);
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}
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ConstraintsDescription ConstraintsDescription::parse(const String & str)
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{
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if (str.empty())
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return {};
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ConstraintsDescription res;
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ParserConstraintDeclarationList parser;
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ASTPtr list = parseQuery(parser, str, 0, DBMS_DEFAULT_MAX_PARSER_DEPTH);
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for (const auto & constraint : list->children)
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res.constraints.push_back(constraint);
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return res;
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}
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ASTs ConstraintsDescription::filterConstraints(ConstraintType selection) const
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{
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const auto ast_to_decr_constraint_type = [](ASTConstraintDeclaration::Type constraint_type) -> UInt8
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{
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switch (constraint_type)
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{
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case ASTConstraintDeclaration::Type::CHECK:
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return static_cast<UInt8>(ConstraintType::CHECK);
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case ASTConstraintDeclaration::Type::ASSUME:
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return static_cast<UInt8>(ConstraintType::ASSUME);
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}
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throw Exception(ErrorCodes::LOGICAL_ERROR, "Unknown constraint type.");
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};
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ASTs res;
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res.reserve(constraints.size());
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for (const auto & constraint : constraints)
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{
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if ((ast_to_decr_constraint_type(constraint->as<ASTConstraintDeclaration>()->type) & static_cast<UInt8>(selection)) != 0)
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{
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res.push_back(constraint);
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}
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}
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return res;
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}
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std::vector<std::vector<CNFQuery::AtomicFormula>> ConstraintsDescription::buildConstraintData() const
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{
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std::vector<std::vector<CNFQuery::AtomicFormula>> constraint_data;
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for (const auto & constraint : filterConstraints(ConstraintsDescription::ConstraintType::ALWAYS_TRUE))
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{
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const auto cnf = TreeCNFConverter::toCNF(constraint->as<ASTConstraintDeclaration>()->expr->ptr())
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.pullNotOutFunctions(); /// TODO: move prepare stage to ConstraintsDescription
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for (const auto & group : cnf.getStatements())
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constraint_data.emplace_back(std::begin(group), std::end(group));
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}
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return constraint_data;
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}
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std::vector<CNFQuery::AtomicFormula> ConstraintsDescription::getAtomicConstraintData() const
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{
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std::vector<CNFQuery::AtomicFormula> constraint_data;
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for (const auto & constraint : filterConstraints(ConstraintsDescription::ConstraintType::ALWAYS_TRUE))
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{
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const auto cnf = TreeCNFConverter::toCNF(constraint->as<ASTConstraintDeclaration>()->expr->ptr())
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.pullNotOutFunctions();
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for (const auto & group : cnf.getStatements())
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{
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if (group.size() == 1)
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constraint_data.push_back(*group.begin());
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}
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}
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return constraint_data;
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}
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std::unique_ptr<ComparisonGraph<ASTPtr>> ConstraintsDescription::buildGraph() const
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{
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static const NameSet relations = { "equals", "less", "lessOrEquals", "greaterOrEquals", "greater" };
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ASTs constraints_for_graph;
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auto atomic_formulas = getAtomicConstraintData();
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for (const auto & atomic_formula : atomic_formulas)
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{
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CNFQuery::AtomicFormula atom{atomic_formula.negative, atomic_formula.ast->clone()};
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pushNotIn(atom);
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auto * func = atom.ast->as<ASTFunction>();
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if (func && relations.contains(func->name))
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{
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assert(!atom.negative);
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constraints_for_graph.push_back(atom.ast);
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}
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}
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return std::make_unique<ComparisonGraph<ASTPtr>>(constraints_for_graph);
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}
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ConstraintsExpressions ConstraintsDescription::getExpressions(const DB::ContextPtr context,
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const DB::NamesAndTypesList & source_columns_) const
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{
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ConstraintsExpressions res;
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res.reserve(constraints.size());
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for (const auto & constraint : constraints)
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{
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auto * constraint_ptr = constraint->as<ASTConstraintDeclaration>();
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if (constraint_ptr->type == ASTConstraintDeclaration::Type::CHECK)
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{
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// TreeRewriter::analyze has query as non-const argument so to avoid accidental query changes we clone it
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ASTPtr expr = constraint_ptr->expr->clone();
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auto syntax_result = TreeRewriter(context).analyze(expr, source_columns_);
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res.push_back(ExpressionAnalyzer(constraint_ptr->expr->clone(), syntax_result, context).getActions(false, true, CompileExpressions::yes));
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}
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}
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return res;
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}
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const ComparisonGraph<ASTPtr> & ConstraintsDescription::getGraph() const
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{
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return *graph;
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}
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const std::vector<std::vector<CNFQuery::AtomicFormula>> & ConstraintsDescription::getConstraintData() const
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{
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return cnf_constraints;
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}
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const ASTs & ConstraintsDescription::getConstraints() const
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{
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return constraints;
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}
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std::optional<ConstraintsDescription::AtomIds> ConstraintsDescription::getAtomIds(const ASTPtr & ast) const
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{
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const auto hash = ast->getTreeHash(/*ignore_aliases=*/ true);
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auto it = ast_to_atom_ids.find(hash);
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if (it != ast_to_atom_ids.end())
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return it->second;
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return std::nullopt;
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}
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std::vector<CNFQuery::AtomicFormula> ConstraintsDescription::getAtomsById(const ConstraintsDescription::AtomIds & ids) const
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{
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std::vector<CNFQuery::AtomicFormula> result;
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for (const auto & id : ids)
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result.push_back(cnf_constraints[id.group_id][id.atom_id]);
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return result;
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}
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ConstraintsDescription::QueryTreeData ConstraintsDescription::getQueryTreeData(const ContextPtr & context, const QueryTreeNodePtr & table_node) const
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{
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QueryTreeData data;
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std::vector<Analyzer::CNF::AtomicFormula> atomic_constraints_data;
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QueryAnalysisPass pass(table_node);
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for (const auto & constraint : filterConstraints(ConstraintsDescription::ConstraintType::ALWAYS_TRUE))
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{
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auto query_tree = buildQueryTree(constraint->as<ASTConstraintDeclaration>()->expr->ptr(), context);
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pass.run(query_tree, context);
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const auto cnf = Analyzer::CNF::toCNF(query_tree, context)
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.pullNotOutFunctions(context);
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for (const auto & group : cnf.getStatements())
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{
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data.cnf_constraints.emplace_back(group.begin(), group.end());
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if (group.size() == 1)
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atomic_constraints_data.emplace_back(*group.begin());
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}
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data.constraints.push_back(std::move(query_tree));
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}
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for (size_t i = 0; i < data.cnf_constraints.size(); ++i)
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for (size_t j = 0; j < data.cnf_constraints[i].size(); ++j)
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data.query_node_to_atom_ids[data.cnf_constraints[i][j].node_with_hash].push_back({i, j});
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/// build graph
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if (constraints.empty())
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{
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data.graph = std::make_unique<ComparisonGraph<QueryTreeNodePtr>>(QueryTreeNodes(), context);
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}
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else
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{
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static const NameSet relations = { "equals", "less", "lessOrEquals", "greaterOrEquals", "greater" };
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QueryTreeNodes constraints_for_graph;
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for (const auto & atomic_formula : atomic_constraints_data)
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{
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Analyzer::CNF::AtomicFormula atom{atomic_formula.negative, atomic_formula.node_with_hash.node->clone()};
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atom = Analyzer::CNF::pushNotIntoFunction(atom, context);
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auto * function_node = atom.node_with_hash.node->as<FunctionNode>();
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if (function_node && relations.contains(function_node->getFunctionName()))
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{
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assert(!atom.negative);
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constraints_for_graph.push_back(atom.node_with_hash.node);
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}
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}
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data.graph = std::make_unique<ComparisonGraph<QueryTreeNodePtr>>(constraints_for_graph, context);
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}
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return data;
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}
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const QueryTreeNodes & ConstraintsDescription::QueryTreeData::getConstraints() const
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{
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return constraints;
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}
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const std::vector<std::vector<Analyzer::CNF::AtomicFormula>> & ConstraintsDescription::QueryTreeData::getConstraintData() const
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{
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return cnf_constraints;
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}
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const ComparisonGraph<QueryTreeNodePtr> & ConstraintsDescription::QueryTreeData::getGraph() const
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{
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return *graph;
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}
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std::optional<ConstraintsDescription::AtomIds> ConstraintsDescription::QueryTreeData::getAtomIds(const QueryTreeNodePtrWithHash & node_with_hash) const
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{
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auto it = query_node_to_atom_ids.find(node_with_hash);
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if (it != query_node_to_atom_ids.end())
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return it->second;
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return std::nullopt;
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}
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std::vector<Analyzer::CNF::AtomicFormula> ConstraintsDescription::QueryTreeData::getAtomsById(const AtomIds & ids) const
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{
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std::vector<Analyzer::CNF::AtomicFormula> result;
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for (const auto & id : ids)
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result.push_back(cnf_constraints[id.group_id][id.atom_id]);
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return result;
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}
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ConstraintsDescription::ConstraintsDescription(const ASTs & constraints_)
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: constraints(constraints_)
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{
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update();
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}
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ConstraintsDescription::ConstraintsDescription(const ConstraintsDescription & other)
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{
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constraints.reserve(other.constraints.size());
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for (const auto & constraint : other.constraints)
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constraints.emplace_back(constraint->clone());
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update();
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}
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ConstraintsDescription & ConstraintsDescription::operator=(const ConstraintsDescription & other)
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{
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constraints.resize(other.constraints.size());
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for (size_t i = 0; i < constraints.size(); ++i)
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constraints[i] = other.constraints[i]->clone();
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update();
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return *this;
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}
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ConstraintsDescription::ConstraintsDescription(ConstraintsDescription && other) noexcept
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: constraints(std::move(other.constraints))
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{
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update();
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}
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ConstraintsDescription & ConstraintsDescription::operator=(ConstraintsDescription && other) noexcept
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{
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constraints = std::move(other.constraints);
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update();
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return *this;
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}
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void ConstraintsDescription::update()
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{
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if (constraints.empty())
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{
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cnf_constraints.clear();
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ast_to_atom_ids.clear();
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graph = std::make_unique<ComparisonGraph<ASTPtr>>(ASTs());
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return;
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}
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cnf_constraints = buildConstraintData();
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ast_to_atom_ids.clear();
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for (size_t i = 0; i < cnf_constraints.size(); ++i)
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for (size_t j = 0; j < cnf_constraints[i].size(); ++j)
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ast_to_atom_ids[cnf_constraints[i][j].ast->getTreeHash(/*ignore_aliases=*/ true)].push_back({i, j});
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graph = buildGraph();
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}
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}
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