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53 lines
1.2 KiB
C++
53 lines
1.2 KiB
C++
#pragma once
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#include <Parsers/IAST.h>
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#include <Storages/IStorage.h>
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#include <vector>
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namespace DB
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{
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class Context;
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struct CollectAliases;
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struct ExecuteTableFunctions;
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class WriteBuffer;
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/** Collect and analyze table-like expressions in section FROM in a query.
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* For every expression, keep its alias.
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*
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* For ordinary tables, determine database and table name, obtain and keep StoragePtr.
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* For subqueries, determine result structure. This requires analysis of subquery, such as type inference.
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* For table functions, grab them from prepared ExecuteTableFunctions object.
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*/
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struct CollectTables
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{
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void process(ASTPtr & ast, const Context & context, const CollectAliases & aliases, ExecuteTableFunctions & table_functions);
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enum class Kind
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{
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OrdinaryTable,
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TableFunction,
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Subquery
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};
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struct TableInfo
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{
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ASTPtr node;
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String database_name;
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String table_name;
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String alias;
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StoragePtr storage;
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Block structure_of_subquery;
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};
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using Tables = std::vector<TableInfo>;
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Tables tables;
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/// Debug output
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void dump(WriteBuffer & out) const;
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};
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}
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