1 | #pragma once |
2 | |
3 | #include <Core/Types.h> |
4 | #include <Core/NamesAndTypes.h> |
5 | #include <Parsers/IdentifierQuotingStyle.h> |
6 | |
7 | |
8 | namespace DB |
9 | { |
10 | |
11 | class IAST; |
12 | class Context; |
13 | |
14 | /** For given ClickHouse query, |
15 | * creates another query in a form of |
16 | * |
17 | * SELECT columns... FROM db.table WHERE ... |
18 | * |
19 | * where 'columns' are all required columns to read from "left" table of original query, |
20 | * and WHERE contains subset of (AND-ed) conditions from original query, |
21 | * that contain only compatible expressions. |
22 | * |
23 | * Compatible expressions are comparisons of identifiers, constants, and logical operations on them. |
24 | */ |
25 | String transformQueryForExternalDatabase( |
26 | const IAST & query, |
27 | const NamesAndTypesList & available_columns, |
28 | IdentifierQuotingStyle identifier_quoting_style, |
29 | const String & database, |
30 | const String & table, |
31 | const Context & context); |
32 | |
33 | } |
34 | |