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#pragma once
#include <Interpreters/InDepthNodeVisitor.h>
#include <Storages/StorageInMemoryMetadata.h>
namespace DB
{
class ASTFunction;
/// Rewrites functions to subcolumns, if possible, to reduce amount of read data.
/// E.g. 'length(arr)' -> 'arr.size0', 'col IS NULL' -> 'col.null'
class RewriteFunctionToSubcolumnData
{
public:
using TypeToVisit = ASTFunction;
void visit(ASTFunction & function, ASTPtr & ast) const;
StorageMetadataPtr metadata_snapshot;
};
using RewriteFunctionToSubcolumnMatcher = OneTypeMatcher<RewriteFunctionToSubcolumnData>;
using RewriteFunctionToSubcolumnVisitor = InDepthNodeVisitor<RewriteFunctionToSubcolumnMatcher, true>;
}
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