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#include <Databases/DDLLoadingDependencyVisitor.h>
#include <Dictionaries/getDictionaryConfigurationFromAST.h>
#include <Interpreters/Context.h>
#include <Interpreters/misc.h>
#include <Parsers/ASTCreateQuery.h>
#include <Parsers/ASTFunction.h>
#include <Parsers/ASTIdentifier.h>
#include <Parsers/ASTLiteral.h>
#include <Parsers/ASTSelectWithUnionQuery.h>
#include <Poco/String.h>
namespace DB
{
using TableLoadingDependenciesVisitor = DDLLoadingDependencyVisitor::Visitor;
TableNamesSet getLoadingDependenciesFromCreateQuery(ContextPtr global_context, const QualifiedTableName & table, const ASTPtr & ast)
{
assert(global_context == global_context->getGlobalContext());
TableLoadingDependenciesVisitor::Data data;
data.default_database = global_context->getCurrentDatabase();
data.create_query = ast;
data.global_context = global_context;
TableLoadingDependenciesVisitor visitor{data};
visitor.visit(ast);
data.dependencies.erase(table);
return data.dependencies;
}
void DDLLoadingDependencyVisitor::visit(const ASTPtr & ast, Data & data)
{
/// Looking for functions in column default expressions and dictionary source definition
if (const auto * function = ast->as<ASTFunction>())
visit(*function, data);
else if (const auto * dict_source = ast->as<ASTFunctionWithKeyValueArguments>())
visit(*dict_source, data);
else if (const auto * storage = ast->as<ASTStorage>())
visit(*storage, data);
}
bool DDLMatcherBase::needChildVisit(const ASTPtr & node, const ASTPtr & child)
{
if (node->as<ASTStorage>())
return false;
if (auto * create = node->as<ASTCreateQuery>())
{
if (child.get() == create->select)
return false;
}
return true;
}
ssize_t DDLMatcherBase::getPositionOfTableNameArgumentToEvaluate(const ASTFunction & function)
{
if (functionIsJoinGet(function.name) || functionIsDictGet(function.name))
return 0;
return -1;
}
ssize_t DDLMatcherBase::getPositionOfTableNameArgumentToVisit(const ASTFunction & function)
{
ssize_t maybe_res = getPositionOfTableNameArgumentToEvaluate(function);
if (0 <= maybe_res)
return maybe_res;
if (functionIsInOrGlobalInOperator(function.name))
{
if (function.children.empty())
return -1;
const auto * args = function.children[0]->as<ASTExpressionList>();
if (!args || args->children.size() != 2)
return -1;
if (args->children[1]->as<ASTFunction>())
return -1;
return 1;
}
return -1;
}
void DDLLoadingDependencyVisitor::visit(const ASTFunction & function, Data & data)
{
ssize_t table_name_arg_idx = getPositionOfTableNameArgumentToVisit(function);
if (table_name_arg_idx < 0)
return;
extractTableNameFromArgument(function, data, table_name_arg_idx);
}
void DDLLoadingDependencyVisitor::visit(const ASTFunctionWithKeyValueArguments & dict_source, Data & data)
{
if (dict_source.name != "clickhouse")
return;
if (!dict_source.elements)
return;
auto config = getDictionaryConfigurationFromAST(data.create_query->as<ASTCreateQuery &>(), data.global_context);
auto info = getInfoIfClickHouseDictionarySource(config, data.global_context);
if (!info || !info->is_local || info->table_name.table.empty())
return;
if (info->table_name.database.empty())
info->table_name.database = data.default_database;
data.dependencies.emplace(std::move(info->table_name));
}
void DDLLoadingDependencyVisitor::visit(const ASTStorage & storage, Data & data)
{
if (!storage.engine)
return;
if (storage.engine->name == "Distributed")
/// Checks that dict* expression was used as sharding_key and builds dependency between the dictionary and current table.
/// Distributed(logs, default, hits[, sharding_key[, policy_name]])
extractTableNameFromArgument(*storage.engine, data, 3);
else if (storage.engine->name == "Dictionary")
extractTableNameFromArgument(*storage.engine, data, 0);
}
void DDLLoadingDependencyVisitor::extractTableNameFromArgument(const ASTFunction & function, Data & data, size_t arg_idx)
{
/// Just ignore incorrect arguments, proper exception will be thrown later
if (!function.arguments || function.arguments->children.size() <= arg_idx)
return;
QualifiedTableName qualified_name;
const auto * arg = function.arguments->as<ASTExpressionList>()->children[arg_idx].get();
if (const auto * dict_function = arg->as<ASTFunction>())
{
if (!functionIsDictGet(dict_function->name))
return;
/// Get the dictionary name from `dict*` function.
const auto * literal_arg = dict_function->arguments->as<ASTExpressionList>()->children[0].get();
const auto * dictionary_name = literal_arg->as<ASTLiteral>();
if (!dictionary_name)
return;
if (dictionary_name->value.getType() != Field::Types::String)
return;
auto maybe_qualified_name = QualifiedTableName::tryParseFromString(dictionary_name->value.get<String>());
if (!maybe_qualified_name)
return;
qualified_name = std::move(*maybe_qualified_name);
}
else if (const auto * literal = arg->as<ASTLiteral>())
{
if (literal->value.getType() != Field::Types::String)
return;
auto maybe_qualified_name = QualifiedTableName::tryParseFromString(literal->value.get<String>());
/// Just return if name if invalid
if (!maybe_qualified_name)
return;
qualified_name = std::move(*maybe_qualified_name);
}
else if (const auto * identifier = dynamic_cast<const ASTIdentifier *>(arg))
{
/// ASTIdentifier or ASTTableIdentifier
auto table_identifier = identifier->createTable();
/// Just return if table identified is invalid
if (!table_identifier)
return;
qualified_name.database = table_identifier->getDatabaseName();
qualified_name.table = table_identifier->shortName();
}
else
{
assert(false);
return;
}
if (qualified_name.database.empty())
{
/// It can be table/dictionary from default database or XML dictionary, but we cannot distinguish it here.
qualified_name.database = data.default_database;
}
data.dependencies.emplace(std::move(qualified_name));
}
}
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