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40 lines
1.1 KiB
C++
40 lines
1.1 KiB
C++
#pragma once
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#include <base/types.h>
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#include <Core/NamesAndTypes.h>
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#include <Parsers/IdentifierQuotingStyle.h>
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#include <Storages/SelectQueryInfo.h>
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#include <Interpreters/Context_fwd.h>
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namespace DB
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{
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class IAST;
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/** For given ClickHouse query,
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* creates another query in a form of
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*
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* SELECT columns... FROM db.table WHERE ...
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*
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* where 'columns' are all required columns to read from "left" table of original query,
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* and WHERE contains subset of (AND-ed) conditions from original query,
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* that contain only compatible expressions.
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*
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* Compatible expressions are comparisons of identifiers, constants, and logical operations on them.
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*
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* Throws INCORRECT_QUERY if external_table_strict_query (from context settings)
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* is set and some expression from WHERE is not compatible.
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*/
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String transformQueryForExternalDatabase(
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const SelectQueryInfo & query_info,
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const Names & column_names,
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const NamesAndTypesList & available_columns,
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IdentifierQuotingStyle identifier_quoting_style,
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LiteralEscapingStyle literal_escaping_style,
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const String & database,
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const String & table,
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ContextPtr context);
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}
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