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Allow cast from Array(Nothing) to Map(Nothing, Nothing)

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This commit is contained in:
Nikolai Kochetov 2024-05-14 10:42:02 +00:00
parent 6c0450f8ff
commit 3eec3f8675
3 changed files with 16 additions and 0 deletions
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7
src/Functions/FunctionsConversion.cpp
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@ -7,6 +7,7 @@
#include <Columns/ColumnFixedString.h>
#include <Columns/ColumnLowCardinality.h>
#include <Columns/ColumnMap.h>
#include <Columns/ColumnNothing.h>
#include <Columns/ColumnNullable.h>
#include <Columns/ColumnObject.h>
#include <Columns/ColumnString.h>
@ -3770,6 +3771,12 @@ private:
}
else if (const auto * from_array = typeid_cast<const DataTypeArray *>(from_type_untyped.get()))
{
if (typeid_cast<const DataTypeNothing *>(from_array->getNestedType().get()))
return [nested = to_type->getNestedType()](ColumnsWithTypeAndName &, const DataTypePtr &, const ColumnNullable *, size_t size)
{
return ColumnMap::create(nested->createColumnConstWithDefaultValue(size)->convertToFullColumnIfConst());
};
const auto * nested_tuple = typeid_cast<const DataTypeTuple *>(from_array->getNestedType().get());
if (!nested_tuple || nested_tuple->getElements().size() != 2)
throw Exception(

3
tests/queries/0_stateless/01787_map_remote.reference
View File

@ -2,3 +2,6 @@
{'a':1,'b':2}
{'a':1,'b':2}
{'a':1,'b':2}
{}
{}
{'':''}

6
tests/queries/0_stateless/01787_map_remote.sql
View File

@ -1,2 +1,8 @@
SELECT map('a', 1, 'b', 2) FROM remote('127.0.0.{1,2}', system, one);
SELECT map('a', 1, 'b', 2) FROM remote('127.0.0.{1,2}');
SELECT map() from remote('127.0.0.{1,2}', system,one);
drop table if exists bug_repro_local;
CREATE TABLE bug_repro_local (`attributes` Map(LowCardinality(String), String)) ENGINE = Log as select map('','');
SELECT if(1, attributes, map()) from remote('127.0.0.{1,2}', default,bug_repro_local) limit 1;