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81 lines
3.2 KiB
C++
81 lines
3.2 KiB
C++
#include <Interpreters/addMissingDefaults.h>
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#include <Common/typeid_cast.h>
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#include <DataTypes/NestedUtils.h>
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#include <DataTypes/DataTypeArray.h>
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#include <Columns/ColumnArray.h>
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#include <Interpreters/evaluateMissingDefaults.h>
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#include <Core/Block.h>
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#include <Storages/ColumnDefault.h>
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namespace DB
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{
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Block addMissingDefaults(const Block & block,
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const NamesAndTypesList & required_columns,
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const ColumnDefaults & column_defaults,
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const Context & context)
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{
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/// For missing columns of nested structure, you need to create not a column of empty arrays, but a column of arrays of correct lengths.
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/// First, remember the offset columns for all arrays in the block.
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std::map<String, ColumnPtr> offset_columns;
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for (size_t i = 0, size = block.columns(); i < size; ++i)
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{
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const auto & elem = block.getByPosition(i);
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if (const ColumnArray * array = typeid_cast<const ColumnArray *>(&*elem.column))
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{
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String offsets_name = Nested::extractTableName(elem.name);
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auto & offsets_column = offset_columns[offsets_name];
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/// If for some reason there are different offset columns for one nested structure, then we take nonempty.
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if (!offsets_column || offsets_column->empty())
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offsets_column = array->getOffsetsPtr();
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}
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}
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const size_t rows = block.rows();
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Block res;
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/// We take given columns from input block and missed columns without default value
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/// (default and materialized will be computed later).
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for (const auto & column : required_columns)
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{
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if (block.has(column.name))
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{
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res.insert(block.getByName(column.name));
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continue;
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}
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if (column_defaults.count(column.name))
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continue;
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String offsets_name = Nested::extractTableName(column.name);
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if (offset_columns.count(offsets_name))
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{
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ColumnPtr offsets_column = offset_columns[offsets_name];
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DataTypePtr nested_type = typeid_cast<const DataTypeArray &>(*column.type).getNestedType();
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UInt64 nested_rows = rows ? get<UInt64>((*offsets_column)[rows - 1]) : 0;
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ColumnPtr nested_column = nested_type->createColumnConstWithDefaultValue(nested_rows)->convertToFullColumnIfConst();
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auto new_column = ColumnArray::create(nested_column, offsets_column);
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res.insert(ColumnWithTypeAndName(std::move(new_column), column.type, column.name));
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continue;
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}
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/** It is necessary to turn a constant column into a full column, since in part of blocks (from other parts),
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* it can be full (or the interpreter may decide that it is constant everywhere).
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*/
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auto new_column = column.type->createColumnConstWithDefaultValue(rows)->convertToFullColumnIfConst();
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res.insert(ColumnWithTypeAndName(std::move(new_column), column.type, column.name));
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}
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/// Computes explicitly specified values (in column_defaults) by default and materialized columns.
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evaluateMissingDefaults(res, required_columns, column_defaults, context);
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return res;
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}
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}
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