Comments (3)
btw, the csv file has the header.
I add the HEADER
clause, it works now, I wonder why the 1st sql select count(*) from external('./t17.csv',COLUMNS => DESCRIPTOR(id int, owner int))
didn't raise an error?
select a.owner, count(*) from external('./t17.csv',COLUMNS => DESCRIPTOR(id int, owner int),HEADER => true ) as a,external('./t17_2.csv',COLUMNS => DESCRIPTOR(id int, owner int),HEADER => true) as b where a.id=b.id group by a.owner ;
from hyper-api-samples.
You are correct, the header is the problem. The single file queries did not fail because count(*)
will just count the number of lines in the CSV file. It does not type-check the values for all the columns. So, in your example Hyper does not check that the values for id
and owner
are valid integers. Since you did not specify header
the count should also be off by one.
The following query will also fail for a single file since now Hyper checks that the values for owner
are valid integers:
select owner, count(*) from external('./t17.csv',COLUMNS => DESCRIPTOR(id int, owner int)) group by owner;
from hyper-api-samples.
thanks @wolfroediger
from hyper-api-samples.
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