[pull] master from ClickHouse:master#405
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pull[bot] merged 4 commits intotraceon:masterfrom Nov 3, 2019
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Can be triggered using the following query:
CREATE TABLE foo (key String, macro String MATERIALIZED __getScalar(key)) Engine=Null();
Trace:
3. 0x00007ffff6d5d526 __assert_fail (libc.so.6)
4. 0x00007ffff41fd931 boost::intrusive_ptr<DB::IColumn const>::operator*() const (libclickhouse_functionsd.so)
5. 0x00007ffff41fcd64 COW<DB::IColumn>::IntrusivePtr<DB::IColumn const>::operator*() const & (libclickhouse_functionsd.so)
6. 0x00007ffff4dc5944 DB::FunctionGetScalar::getReturnTypeImpl() const (libclickhouse_functionsd.so)
(Even though it is internal I guess it is better to fix it)
Refs: #7392
Cc: @amosbird
Check column for __getScalar() (avoids assertion)
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