1 | #include <Parsers/ASTIdentifier.h> |
2 | #include <Parsers/ASTRenameQuery.h> |
3 | |
4 | #include <Parsers/CommonParsers.h> |
5 | #include <Parsers/ParserRenameQuery.h> |
6 | |
7 | |
8 | namespace DB |
9 | { |
10 | |
11 | |
12 | /// Parse database.table or table. |
13 | static bool parseDatabaseAndTable( |
14 | ASTRenameQuery::Table & db_and_table, IParser::Pos & pos, Expected & expected) |
15 | { |
16 | ParserIdentifier name_p; |
17 | ParserToken s_dot(TokenType::Dot); |
18 | |
19 | ASTPtr database; |
20 | ASTPtr table; |
21 | |
22 | if (!name_p.parse(pos, table, expected)) |
23 | return false; |
24 | |
25 | if (s_dot.ignore(pos, expected)) |
26 | { |
27 | database = table; |
28 | if (!name_p.parse(pos, table, expected)) |
29 | return false; |
30 | } |
31 | |
32 | db_and_table.database.clear(); |
33 | tryGetIdentifierNameInto(database, db_and_table.database); |
34 | tryGetIdentifierNameInto(table, db_and_table.table); |
35 | |
36 | return true; |
37 | } |
38 | |
39 | |
40 | bool ParserRenameQuery::parseImpl(Pos & pos, ASTPtr & node, Expected & expected) |
41 | { |
42 | ParserKeyword s_rename_table("RENAME TABLE" ); |
43 | ParserKeyword s_to("TO" ); |
44 | ParserToken s_comma(TokenType::Comma); |
45 | |
46 | if (!s_rename_table.ignore(pos, expected)) |
47 | return false; |
48 | |
49 | ASTRenameQuery::Elements elements; |
50 | |
51 | while (true) |
52 | { |
53 | if (!elements.empty() && !s_comma.ignore(pos)) |
54 | break; |
55 | |
56 | elements.push_back(ASTRenameQuery::Element()); |
57 | |
58 | if (!parseDatabaseAndTable(elements.back().from, pos, expected) |
59 | || !s_to.ignore(pos) |
60 | || !parseDatabaseAndTable(elements.back().to, pos, expected)) |
61 | return false; |
62 | } |
63 | |
64 | String cluster_str; |
65 | if (ParserKeyword{"ON" }.ignore(pos, expected)) |
66 | { |
67 | if (!ASTQueryWithOnCluster::parse(pos, cluster_str, expected)) |
68 | return false; |
69 | } |
70 | |
71 | auto query = std::make_shared<ASTRenameQuery>(); |
72 | query->cluster = cluster_str; |
73 | node = query; |
74 | |
75 | query->elements = elements; |
76 | return true; |
77 | } |
78 | |
79 | |
80 | } |
81 | |