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49 lines
1.1 KiB
C++
49 lines
1.1 KiB
C++
#pragma once
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#include <DB/Parsers/IAST.h>
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#include <DB/Analyzers/CollectTables.h>
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#include <unordered_map>
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namespace DB
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{
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class WriteBuffer;
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struct CollectAliases;
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struct CollectTables;
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/** For every identifier, that is not an alias,
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* determine from what table it comes,
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* its original name in table,
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* and its data type.
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*
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* Also:
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* - expand asterisks (such as *, t.*, db.table.* and (TODO) even db.table.nested.*) to corresponding list of columns;
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* - translate count(*) to count();
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* - TODO expand alias columns that come from table definition;
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* - TODO replace column names to fully qualified names: identical columns will have same names.
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*
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* If column is not found or in case of ambiguity, throw an exception.
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*/
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struct AnalyzeColumns
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{
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void process(ASTPtr & ast, const CollectAliases & aliases, const CollectTables & tables);
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struct ColumnInfo
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{
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ASTPtr node;
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CollectTables::TableInfo table;
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String name_in_table;
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DataTypePtr data_type;
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};
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using Columns = std::unordered_map<String, ColumnInfo>;
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Columns columns;
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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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