mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-03 13:02:00 +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
39 lines
895 B
C++
39 lines
895 B
C++
#pragma once
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#include <Common/assert_cast.h>
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#include <Core/Names.h>
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#include <Core/NamesAndTypes.h>
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#include <Parsers/ASTTableOverrides.h>
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namespace DB
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{
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struct StorageInMemoryMetadata;
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using NameToTypeMap = std::map<String, DataTypePtr>;
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struct TableOverrideAnalyzer
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{
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struct Result
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{
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NameToTypeMap existing_types;
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NamesAndTypes order_by_columns;
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NamesAndTypes primary_key_columns;
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NamesAndTypes partition_by_columns;
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NamesAndTypes sample_by_columns;
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NamesAndTypes ttl_columns;
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NamesAndTypes added_columns;
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NamesAndTypes modified_columns;
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void appendTo(WriteBuffer &);
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};
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ASTTableOverride * override;
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explicit TableOverrideAnalyzer(ASTPtr ast) : override(assert_cast<ASTTableOverride *>(ast.get())) { }
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void analyze(const StorageInMemoryMetadata & metadata, Result & result) const;
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};
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}
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