mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-16 03:12:43 +00:00
129 lines
3.5 KiB
C++
129 lines
3.5 KiB
C++
#include <Parsers/ExpressionListParsers.h>
|
|
#include <Parsers/parseQuery.h>
|
|
#include <Parsers/queryToString.h>
|
|
#include <IO/WriteBuffer.h>
|
|
#include <IO/WriteHelpers.h>
|
|
#include <IO/ReadBuffer.h>
|
|
#include <IO/ReadHelpers.h>
|
|
#include <IO/WriteBufferFromString.h>
|
|
#include <IO/ReadBufferFromString.h>
|
|
#include <Storages/ColumnsDescription.h>
|
|
#include <DataTypes/DataTypeFactory.h>
|
|
|
|
|
|
namespace DB
|
|
{
|
|
|
|
namespace ErrorCodes
|
|
{
|
|
extern const int CANNOT_PARSE_TEXT;
|
|
}
|
|
|
|
|
|
template <bool store>
|
|
String ColumnsDescription<store>::toString() const
|
|
{
|
|
WriteBufferFromOwnString buf;
|
|
|
|
writeString("columns format version: 1\n", buf);
|
|
writeText(columns.size() + materialized.size() + alias.size(), buf);
|
|
writeString(" columns:\n", buf);
|
|
|
|
const auto write_columns = [this, &buf] (const NamesAndTypes & columns)
|
|
{
|
|
for (const auto & column : columns)
|
|
{
|
|
const auto it = defaults.find(column.name);
|
|
|
|
writeBackQuotedString(column.name, buf);
|
|
writeChar(' ', buf);
|
|
writeString(column.type->getName(), buf);
|
|
if (it == std::end(defaults))
|
|
{
|
|
writeChar('\n', buf);
|
|
continue;
|
|
}
|
|
else
|
|
writeChar('\t', buf);
|
|
|
|
writeString(DB::toString(it->second.type), buf);
|
|
writeChar('\t', buf);
|
|
writeString(queryToString(it->second.expression), buf);
|
|
writeChar('\n', buf);
|
|
}
|
|
};
|
|
|
|
write_columns(columns);
|
|
write_columns(materialized);
|
|
write_columns(alias);
|
|
|
|
return buf.str();
|
|
}
|
|
|
|
|
|
template <>
|
|
ColumnsDescription<true> ColumnsDescription<true>::parse(const String & str)
|
|
{
|
|
ReadBufferFromString buf{str};
|
|
|
|
assertString("columns format version: 1\n", buf);
|
|
size_t count{};
|
|
readText(count, buf);
|
|
assertString(" columns:\n", buf);
|
|
|
|
ParserExpression expr_parser;
|
|
const DataTypeFactory & data_type_factory = DataTypeFactory::instance();
|
|
|
|
ColumnsDescription<true> result{};
|
|
for (size_t i = 0; i < count; ++i)
|
|
{
|
|
String column_name;
|
|
readBackQuotedStringWithSQLStyle(column_name, buf);
|
|
assertChar(' ', buf);
|
|
|
|
String type_name;
|
|
readString(type_name, buf);
|
|
auto type = data_type_factory.get(type_name);
|
|
if (*buf.position() == '\n')
|
|
{
|
|
assertChar('\n', buf);
|
|
|
|
result.columns.emplace_back(column_name, std::move(type));
|
|
continue;
|
|
}
|
|
assertChar('\t', buf);
|
|
|
|
String default_type_str;
|
|
readString(default_type_str, buf);
|
|
const auto default_type = columnDefaultTypeFromString(default_type_str);
|
|
assertChar('\t', buf);
|
|
|
|
String default_expr_str;
|
|
readText(default_expr_str, buf);
|
|
assertChar('\n', buf);
|
|
|
|
const char * begin = default_expr_str.data();
|
|
const auto end = begin + default_expr_str.size();
|
|
ASTPtr default_expr = parseQuery(expr_parser, begin, end, "default expression");
|
|
|
|
if (ColumnDefaultType::Default == default_type)
|
|
result.columns.emplace_back(column_name, std::move(type));
|
|
else if (ColumnDefaultType::Materialized == default_type)
|
|
result.materialized.emplace_back(column_name, std::move(type));
|
|
else if (ColumnDefaultType::Alias == default_type)
|
|
result.alias.emplace_back(column_name, std::move(type));
|
|
|
|
result.defaults.emplace(column_name, ColumnDefault{default_type, default_expr});
|
|
}
|
|
|
|
assertEOF(buf);
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
template struct ColumnsDescription<false>;
|
|
template struct ColumnsDescription<true>;
|
|
|
|
}
|