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#pragma once
#include "clickhouse_config.h"
#if USE_AWS_S3
#include <TableFunctions/ITableFunction.h>
#include <TableFunctions/TableFunctionS3.h>
#include <TableFunctions/ITableFunctionCluster.h>
#include <Storages/StorageS3Cluster.h>
namespace DB
{
class Context;
/**
* s3cluster(cluster_name, source, [access_key_id, secret_access_key,] format, structure, compression_method)
* A table function, which allows to process many files from S3 on a specific cluster
* On initiator it creates a connection to _all_ nodes in cluster, discloses asterisks
* in S3 file path and dispatch each file dynamically.
* On worker node it asks initiator about next task to process, processes it.
* This is repeated until the tasks are finished.
*/
class TableFunctionS3Cluster : public ITableFunctionCluster<TableFunctionS3>
{
public:
static constexpr auto name = "s3Cluster";
static constexpr auto signature = " - cluster, url\n"
" - cluster, url, format\n"
" - cluster, url, format, structure\n"
" - cluster, url, access_key_id, secret_access_key\n"
" - cluster, url, format, structure, compression_method\n"
" - cluster, url, access_key_id, secret_access_key, format\n"
" - cluster, url, access_key_id, secret_access_key, format, structure\n"
" - cluster, url, access_key_id, secret_access_key, format, structure, compression_method\n"
"All signatures supports optional headers (specified as `headers('name'='value', 'name2'='value2')`)";
String getName() const override
{
return name;
}
String getSignature() const override
{
return signature;
}
protected:
StoragePtr executeImpl(
const ASTPtr & ast_function,
ContextPtr context,
const std::string & table_name,
ColumnsDescription cached_columns,
bool is_insert_query) const override;
const char * getStorageTypeName() const override { return "S3Cluster"; }
};
}
#endif
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