blob: fb6af21907ea6572423c5a0c1f25684fa213dfb8 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
#pragma once
#include <base/types.h>
#include <Core/NamesAndTypes.h>
#include <Parsers/IdentifierQuotingStyle.h>
#include <Storages/SelectQueryInfo.h>
#include <Interpreters/Context_fwd.h>
namespace DB
{
class IAST;
/** For given ClickHouse query,
* creates another query in a form of
*
* SELECT columns... FROM db.table WHERE ...
*
* where 'columns' are all required columns to read from "left" table of original query,
* and WHERE contains subset of (AND-ed) conditions from original query,
* that contain only compatible expressions.
*
* Compatible expressions are comparisons of identifiers, constants, and logical operations on them.
*
* Throws INCORRECT_QUERY if external_table_strict_query (from context settings)
* is set and some expression from WHERE is not compatible.
*/
String transformQueryForExternalDatabase(
const SelectQueryInfo & query_info,
const Names & column_names,
const NamesAndTypesList & available_columns,
IdentifierQuotingStyle identifier_quoting_style,
LiteralEscapingStyle literal_escaping_style,
const String & database,
const String & table,
ContextPtr context);
}
|
