ClickHouse/dbms/src/Interpreters/InterpreterExistsQuery.cpp

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#include <Storages/IStorage.h>
#include <Parsers/TablePropertiesQueriesASTs.h>
#include <DataStreams/OneBlockInputStream.h>
#include <DataStreams/BlockIO.h>
#include <DataStreams/copyData.h>
#include <DataTypes/DataTypesNumber.h>
#include <Columns/ColumnsNumber.h>
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#include <Interpreters/Context.h>
#include <Interpreters/InterpreterExistsQuery.h>
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#include <Common/typeid_cast.h>
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namespace DB
{
BlockIO InterpreterExistsQuery::execute()
{
BlockIO res;
res.in = executeImpl();
return res;
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}
Block InterpreterExistsQuery::getSampleBlock()
{
return Block{{
ColumnUInt8::create(),
std::make_shared<DataTypeUInt8>(),
"result" }};
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}
BlockInputStreamPtr InterpreterExistsQuery::executeImpl()
{
const auto & ast = query_ptr->as<ASTExistsQuery &>();
bool res = ast.temporary ? context.isExternalTableExist(ast.table) : context.isTableExist(ast.database, ast.table);
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return std::make_shared<OneBlockInputStream>(Block{{
ColumnUInt8::create(1, res),
std::make_shared<DataTypeUInt8>(),
"result" }});
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}
}