ClickHouse/dbms/programs/copier/Internals.cpp

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#include "Internals.h"
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#include <Storages/MergeTree/MergeTreeData.h>
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namespace DB
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{
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namespace ErrorCodes
{
extern const int BAD_ARGUMENTS;
}
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using ConfigurationPtr = Poco::AutoPtr<Poco::Util::AbstractConfiguration>;
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ConfigurationPtr getConfigurationFromXMLString(const std::string & xml_data)
{
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std::stringstream ss(xml_data);
Poco::XML::InputSource input_source{ss};
return {new Poco::Util::XMLConfiguration{&input_source}};
}
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String getQuotedTable(const String & database, const String & table)
{
if (database.empty())
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return backQuoteIfNeed(table);
return backQuoteIfNeed(database) + "." + backQuoteIfNeed(table);
}
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String getQuotedTable(const DatabaseAndTableName & db_and_table)
{
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return getQuotedTable(db_and_table.first, db_and_table.second);
}
// Creates AST representing 'ENGINE = Distributed(cluster, db, table, [sharding_key])
std::shared_ptr<ASTStorage> createASTStorageDistributed(
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const String & cluster_name, const String & database, const String & table,
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const ASTPtr & sharding_key_ast)
{
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auto args = std::make_shared<ASTExpressionList>();
args->children.emplace_back(std::make_shared<ASTLiteral>(cluster_name));
args->children.emplace_back(std::make_shared<ASTIdentifier>(database));
args->children.emplace_back(std::make_shared<ASTIdentifier>(table));
if (sharding_key_ast)
args->children.emplace_back(sharding_key_ast);
auto engine = std::make_shared<ASTFunction>();
engine->name = "Distributed";
engine->arguments = args;
auto storage = std::make_shared<ASTStorage>();
storage->set(storage->engine, engine);
return storage;
}
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BlockInputStreamPtr squashStreamIntoOneBlock(const BlockInputStreamPtr & stream)
{
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return std::make_shared<SquashingBlockInputStream>(
stream,
std::numeric_limits<size_t>::max(),
std::numeric_limits<size_t>::max());
}
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Block getBlockWithAllStreamData(const BlockInputStreamPtr & stream)
{
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return squashStreamIntoOneBlock(stream)->read();
}
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bool isExtendedDefinitionStorage(const ASTPtr & storage_ast)
{
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const auto & storage = storage_ast->as<ASTStorage &>();
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return storage.partition_by || storage.order_by || storage.sample_by;
}
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ASTPtr extractPartitionKey(const ASTPtr & storage_ast)
{
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String storage_str = queryToString(storage_ast);
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const auto & storage = storage_ast->as<ASTStorage &>();
const auto & engine = storage.engine->as<ASTFunction &>();
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if (!endsWith(engine.name, "MergeTree"))
{
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throw Exception(
"Unsupported engine was specified in " + storage_str + ", only *MergeTree engines are supported",
ErrorCodes::BAD_ARGUMENTS);
}
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if (isExtendedDefinitionStorage(storage_ast))
{
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if (storage.partition_by)
return storage.partition_by->clone();
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static const char * all = "all";
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return std::make_shared<ASTLiteral>(Field(all, strlen(all)));
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}
else
{
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bool is_replicated = startsWith(engine.name, "Replicated");
size_t min_args = is_replicated ? 3 : 1;
if (!engine.arguments)
throw Exception("Expected arguments in " + storage_str, ErrorCodes::BAD_ARGUMENTS);
ASTPtr arguments_ast = engine.arguments->clone();
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ASTs & arguments = arguments_ast->children;
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if (arguments.size() < min_args)
throw Exception("Expected at least " + toString(min_args) + " arguments in " + storage_str,
ErrorCodes::BAD_ARGUMENTS);
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ASTPtr & month_arg = is_replicated ? arguments[2] : arguments[1];
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return makeASTFunction("toYYYYMM", month_arg->clone());
}
}
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ASTPtr extractPrimaryKey(const ASTPtr & storage_ast)
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{
String storage_str = queryToString(storage_ast);
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const auto & storage = storage_ast->as<ASTStorage &>();
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const auto & engine = storage.engine->as<ASTFunction &>();
if (!endsWith(engine.name, "MergeTree"))
{
throw Exception("Unsupported engine was specified in " + storage_str + ", only *MergeTree engines are supported",
ErrorCodes::BAD_ARGUMENTS);
}
if (!isExtendedDefinitionStorage(storage_ast))
{
throw Exception("Is not extended deginition storage " + storage_str + " Will be fixed later.",
ErrorCodes::BAD_ARGUMENTS);
}
if (storage.primary_key)
return storage.primary_key->clone();
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return nullptr;
}
ASTPtr extractOrderBy(const ASTPtr & storage_ast)
{
String storage_str = queryToString(storage_ast);
const auto & storage = storage_ast->as<ASTStorage &>();
const auto & engine = storage.engine->as<ASTFunction &>();
if (!endsWith(engine.name, "MergeTree"))
{
throw Exception("Unsupported engine was specified in " + storage_str + ", only *MergeTree engines are supported",
ErrorCodes::BAD_ARGUMENTS);
}
if (!isExtendedDefinitionStorage(storage_ast))
{
throw Exception("Is not extended deginition storage " + storage_str + " Will be fixed later.",
ErrorCodes::BAD_ARGUMENTS);
}
if (storage.order_by)
return storage.order_by->clone();
throw Exception("ORDER BY cannot be empty", ErrorCodes::BAD_ARGUMENTS);
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}
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String createCommaSeparatedStringFrom(const Names & strings)
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{
String answer;
for (auto & string: strings)
answer += string + ", ";
/// Remove last comma and space
answer.pop_back();
answer.pop_back();
return answer;
}
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Names extractPrimaryKeyColumnNames(const ASTPtr & storage_ast)
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{
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const auto sorting_key_ast = extractOrderBy(storage_ast);
const auto primary_key_ast = extractPrimaryKey(storage_ast);
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const auto sorting_key_expr_list = MergeTreeData::extractKeyExpressionList(sorting_key_ast);
const auto primary_key_expr_list = primary_key_ast
? MergeTreeData::extractKeyExpressionList(primary_key_ast) : sorting_key_expr_list->clone();
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/// VersionedCollapsing ???
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size_t primary_key_size = primary_key_expr_list->children.size();
size_t sorting_key_size = sorting_key_expr_list->children.size();
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if (primary_key_size > sorting_key_size)
throw Exception("Primary key must be a prefix of the sorting key, but its length: "
+ toString(primary_key_size) + " is greater than the sorting key length: " + toString(sorting_key_size),
ErrorCodes::BAD_ARGUMENTS);
Names primary_key_columns;
Names sorting_key_columns;
NameSet primary_key_columns_set;
for (size_t i = 0; i < sorting_key_size; ++i)
{
String sorting_key_column = sorting_key_expr_list->children[i]->getColumnName();
sorting_key_columns.push_back(sorting_key_column);
if (i < primary_key_size)
{
String pk_column = primary_key_expr_list->children[i]->getColumnName();
if (pk_column != sorting_key_column)
throw Exception("Primary key must be a prefix of the sorting key, but in position "
+ toString(i) + " its column is " + pk_column + ", not " + sorting_key_column,
ErrorCodes::BAD_ARGUMENTS);
if (!primary_key_columns_set.emplace(pk_column).second)
throw Exception("Primary key contains duplicate columns", ErrorCodes::BAD_ARGUMENTS);
primary_key_columns.push_back(pk_column);
}
}
return primary_key_columns;
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}
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String extractReplicatedTableZookeeperPath(const ASTPtr & storage_ast)
{
String storage_str = queryToString(storage_ast);
const auto & storage = storage_ast->as<ASTStorage &>();
const auto & engine = storage.engine->as<ASTFunction &>();
if (!endsWith(engine.name, "MergeTree"))
{
throw Exception(
"Unsupported engine was specified in " + storage_str + ", only *MergeTree engines are supported",
ErrorCodes::BAD_ARGUMENTS);
}
if (!startsWith(engine.name, "Replicated"))
{
return "";
}
auto replicated_table_arguments = engine.arguments->children;
auto zk_table_path_ast = replicated_table_arguments[0]->as<ASTLiteral &>();
auto zk_table_path_string = zk_table_path_ast.value.safeGet<String>();
return zk_table_path_string;
}
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ShardPriority getReplicasPriority(const Cluster::Addresses & replicas, const std::string & local_hostname, UInt8 random)
{
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ShardPriority res;
if (replicas.empty())
return res;
res.is_remote = 1;
for (auto & replica : replicas)
{
if (isLocalAddress(DNSResolver::instance().resolveHost(replica.host_name)))
{
res.is_remote = 0;
break;
}
}
res.hostname_difference = std::numeric_limits<size_t>::max();
for (auto & replica : replicas)
{
size_t difference = getHostNameDifference(local_hostname, replica.host_name);
res.hostname_difference = std::min(difference, res.hostname_difference);
}
res.random = random;
return res;
}
}