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78 lines
1.9 KiB
C++
78 lines
1.9 KiB
C++
#include <Core/SortDescription.h>
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#include <Core/Block.h>
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#include <IO/Operators.h>
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#include <Common/JSONBuilder.h>
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namespace DB
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{
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void dumpSortDescription(const SortDescription & description, const Block & header, WriteBuffer & out)
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{
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bool first = true;
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for (const auto & desc : description)
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{
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if (!first)
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out << ", ";
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first = false;
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if (!desc.column_name.empty())
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out << desc.column_name;
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else
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{
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if (desc.column_number < header.columns())
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out << header.getByPosition(desc.column_number).name;
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else
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out << "?";
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out << " (pos " << desc.column_number << ")";
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}
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if (desc.direction > 0)
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out << " ASC";
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else
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out << " DESC";
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if (desc.with_fill)
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out << " WITH FILL";
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}
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}
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void SortColumnDescription::explain(JSONBuilder::JSONMap & map, const Block & header) const
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{
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if (!column_name.empty())
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map.add("Column", column_name);
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else
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{
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if (column_number < header.columns())
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map.add("Column", header.getByPosition(column_number).name);
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map.add("Position", column_number);
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}
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map.add("Ascending", direction > 0);
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map.add("With Fill", with_fill);
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}
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std::string dumpSortDescription(const SortDescription & description)
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{
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WriteBufferFromOwnString wb;
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dumpSortDescription(description, Block{}, wb);
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return wb.str();
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}
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JSONBuilder::ItemPtr explainSortDescription(const SortDescription & description, const Block & header)
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{
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auto json_array = std::make_unique<JSONBuilder::JSONArray>();
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for (const auto & descr : description)
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{
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auto json_map = std::make_unique<JSONBuilder::JSONMap>();
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descr.explain(*json_map, header);
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json_array->add(std::move(json_map));
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}
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return json_array;
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}
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}
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