mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-23 16:12:01 +00:00
6fbb9f5e87
Example:
```sql
EXPLAIN TABLE OVERRIDE mysql('127.0.0.1:3306', 'db', 'table', 'user', 'pw')
PARTITION BY tuple(toYYYYMM(created), id % 8)
```
Validations done:
* check that storage overrides do not reference unknown or nullable columns
* check that default specifier is not modified for columns
53 lines
1.4 KiB
C++
53 lines
1.4 KiB
C++
#pragma once
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#include <Parsers/IAST.h>
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#include <map>
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namespace DB
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{
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class ASTColumns;
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class ASTCreateQuery;
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class ASTIdentifier;
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class ASTStorage;
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/// Storage and column overrides for a single table, for example:
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///
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/// TABLE OVERRIDE `foo` (PARTITION BY toYYYYMM(`createtime`))
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///
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class ASTTableOverride : public IAST
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{
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public:
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String table_name;
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ASTColumns * columns = nullptr;
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ASTStorage * storage = nullptr;
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bool is_standalone = true;
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String getID(char) const override { return "TableOverride " + table_name; }
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ASTPtr clone() const override;
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void formatImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const override;
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};
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/// List of table overrides, for example:
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///
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/// TABLE OVERRIDE `foo` (PARTITION BY toYYYYMM(`createtime`)),
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/// TABLE OVERRIDE `bar` (SAMPLE BY `id`)
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///
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class ASTTableOverrideList : public IAST
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{
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public:
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String getID(char) const override { return "TableOverrideList"; }
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ASTPtr clone() const override;
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void formatImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const override;
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void setTableOverride(const String & name, const ASTPtr ast);
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void removeTableOverride(const String & name);
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ASTPtr tryGetTableOverride(const String & name) const;
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bool hasOverride(const String & name) const;
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private:
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std::map<String, size_t> positions;
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};
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}
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