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33 lines
793 B
C++
33 lines
793 B
C++
#include <Storages/ReplaceAliasByExpressionVisitor.h>
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#include <Parsers/ASTIdentifier.h>
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#include <Parsers/ASTLiteral.h>
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#include <Storages/ColumnsDescription.h>
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#include <Common/typeid_cast.h>
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namespace DB
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{
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void ReplaceAliasByExpressionMatcher::visit(ASTPtr & ast, Data & data)
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{
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if (auto * identifier = ast->as<ASTIdentifier>())
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{
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visit(*identifier, ast, data);
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}
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}
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void ReplaceAliasByExpressionMatcher::visit(const ASTIdentifier & column, ASTPtr & ast, Data & data)
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{
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const auto & column_name = column.name();
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if (data.columns.hasAlias(column_name))
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{
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/// Alias expr is saved in default expr.
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if (auto col_default = data.columns.getDefault(column_name))
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{
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ast = col_default->expression->clone();
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}
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}
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}
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}
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