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#include <Parsers/Access/ParserRowPolicyName.h>
#include <Parsers/Access/ASTRowPolicyName.h>
#include <Parsers/ASTQueryWithOnCluster.h>
#include <Parsers/CommonParsers.h>
#include <Parsers/ExpressionListParsers.h>
#include <Parsers/parseIdentifierOrStringLiteral.h>
#include <Parsers/parseDatabaseAndTableName.h>
#include <base/insertAtEnd.h>
namespace DB
{
namespace
{
bool parseOnCluster(IParserBase::Pos & pos, Expected & expected, String & cluster)
{
return IParserBase::wrapParseImpl(pos, [&]
{
return ParserKeyword{"ON"}.ignore(pos, expected) && ASTQueryWithOnCluster::parse(pos, cluster, expected);
});
}
bool parseDBAndTableName(IParser::Pos & pos, Expected & expected, String & database, String & table_name)
{
return IParserBase::wrapParseImpl(pos, [&]
{
String res_database, res_table_name;
bool is_any_database = false;
bool is_any_table = false;
if (!parseDatabaseAndTableNameOrAsterisks(pos, expected, res_database, is_any_database, res_table_name, is_any_table)
|| is_any_database)
{
return false;
}
else if (is_any_table)
{
res_table_name = RowPolicyName::ANY_TABLE_MARK;
}
/// If table is specified without DB it cannot be followed by "ON"
/// (but can be followed by "ON CLUSTER").
/// The following code is necessary to figure out while parsing something like
/// policy1 ON table1, policy2 ON table2
/// that policy2 is another policy, not another table.
auto end_pos = pos;
if (res_database.empty() && ParserKeyword{"ON"}.ignore(pos, expected))
{
String unused;
if (ASTQueryWithOnCluster::parse(pos, unused, expected))
pos = end_pos;
else
return false;
}
database = std::move(res_database);
table_name = std::move(res_table_name);
return true;
});
}
bool parseOnDBAndTableName(IParser::Pos & pos, Expected & expected, String & database, String & table_name)
{
return IParserBase::wrapParseImpl(pos, [&]
{
return ParserKeyword{"ON"}.ignore(pos, expected) && parseDBAndTableName(pos, expected, database, table_name);
});
}
bool parseOnDBAndTableNames(IParser::Pos & pos, Expected & expected, std::vector<std::pair<String, String>> & database_and_table_names)
{
return IParserBase::wrapParseImpl(pos, [&]
{
if (!ParserKeyword{"ON"}.ignore(pos, expected))
return false;
std::vector<std::pair<String, String>> res;
auto parse_db_and_table_name = [&]
{
String database, table_name;
if (!parseDBAndTableName(pos, expected, database, table_name))
return false;
res.emplace_back(std::move(database), std::move(table_name));
return true;
};
if (!ParserList::parseUtil(pos, expected, parse_db_and_table_name, false))
return false;
database_and_table_names = std::move(res);
return true;
});
}
bool parseRowPolicyNamesAroundON(IParser::Pos & pos, Expected & expected,
bool allow_multiple_short_names,
bool allow_multiple_tables,
bool allow_on_cluster,
std::vector<RowPolicyName> & full_names,
String & cluster)
{
return IParserBase::wrapParseImpl(pos, [&]
{
std::vector<String> short_names;
if (allow_multiple_short_names)
{
if (!parseIdentifiersOrStringLiterals(pos, expected, short_names))
return false;
}
else
{
if (!parseIdentifierOrStringLiteral(pos, expected, short_names.emplace_back()))
return false;
}
String res_cluster;
if (allow_on_cluster)
parseOnCluster(pos, expected, res_cluster);
std::vector<std::pair<String, String>> database_and_table_names;
if (allow_multiple_tables && (short_names.size() == 1))
{
if (!parseOnDBAndTableNames(pos, expected, database_and_table_names))
return false;
}
else
{
String database, table_name;
if (!parseOnDBAndTableName(pos, expected, database, table_name))
return false;
database_and_table_names.emplace_back(std::move(database), std::move(table_name));
}
if (allow_on_cluster && res_cluster.empty())
parseOnCluster(pos, expected, res_cluster);
assert(!short_names.empty());
assert(!database_and_table_names.empty());
full_names.clear();
for (const String & short_name : short_names)
for (const auto & [database, table_name] : database_and_table_names)
full_names.push_back({short_name, database, table_name});
cluster = std::move(res_cluster);
return true;
});
}
}
bool ParserRowPolicyName::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
{
std::vector<RowPolicyName> full_names;
String cluster;
if (!parseRowPolicyNamesAroundON(pos, expected, false, false, allow_on_cluster, full_names, cluster))
return false;
assert(full_names.size() == 1);
auto result = std::make_shared<ASTRowPolicyName>();
result->full_name = std::move(full_names.front());
result->cluster = std::move(cluster);
node = result;
return true;
}
bool ParserRowPolicyNames::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
{
std::vector<RowPolicyName> full_names;
size_t num_added_names_last_time = 0;
String cluster;
auto parse_around_on = [&]
{
if (!full_names.empty())
{
if ((num_added_names_last_time != 1) || !cluster.empty())
return false;
}
std::vector<RowPolicyName> new_full_names;
if (!parseRowPolicyNamesAroundON(pos, expected, full_names.empty(), full_names.empty(), allow_on_cluster, new_full_names, cluster))
return false;
num_added_names_last_time = new_full_names.size();
insertAtEnd(full_names, std::move(new_full_names));
return true;
};
if (!ParserList::parseUtil(pos, expected, parse_around_on, false))
return false;
auto result = std::make_shared<ASTRowPolicyNames>();
result->full_names = std::move(full_names);
result->cluster = std::move(cluster);
node = result;
return true;
}
}
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