ERROR: could not find pathkey item to sort

Hello,

ref:
https://github.com/adjust/parquet_fdw#basic-usage
and
https://github.com/adjust/parquet_fdw/issues/58

I came across this error/crash when using partitioning of a table with
foreign tables (parquet_fdw) as partitions.
It might be an issue with parquet_fdw nothing with postgresql, but I am not
able to figure out why it crashes around the sorted option set.

to reproduce,

vijay=# CREATE FOREIGN TABLE example1 (
one INT8,
two INT8[],
three TEXT,
four TIMESTAMP,
five DATE,
six BOOL,
seven FLOAT8)
SERVER parquet_srv
OPTIONS (filename '/tmp/parquet_fdw/data/simple/example1.parquet', sorted
'one');

CREATE FOREIGN TABLE example2 (
one INT8,
two INT8[],
three TEXT,
four TIMESTAMP,
five DATE,
six BOOL,
seven FLOAT8)
SERVER parquet_srv
OPTIONS (filename '/tmp/parquet_fdw/data/simple/example2.parquet', sorted
'one');
CREATE FOREIGN TABLE
CREATE FOREIGN TABLE
vijay=# select * from example1;
one | two | three | four | five | six | seven
-----+------------+-------+---------------------+------------+-----+-------
1 | {1,2,3} | foo | 2018-01-01 00:00:00 | 2018-01-01 | t | 0.5
2 | {NULL,5,6} | bar | 2018-01-02 00:00:00 | 2018-01-02 | f |
3 | {7,8,9} | baz | 2018-01-03 00:00:00 | 2018-01-03 | t | 1
4 | {10,11,12} | uno | 2018-01-04 00:00:10 | 2018-01-04 | f | 1.5
5 | {13,14,15} | dos | 2018-01-05 00:00:00 | 2018-01-05 | f |
6 | {16,17,18} | tres | 2018-01-06 00:00:00 | 2018-01-06 | f | 2
(6 rows)

vijay=# select * from example2;
one | two | three | four | five | six | seven
-----+---------+-------+---------------------+------------+-----+-------
1 | {19,20} | eins | 2018-01-01 00:00:00 | 2018-01-01 | t |
3 | {21,22} | zwei | 2018-01-03 00:00:00 | 2018-01-03 | f |
5 | {23,24} | drei | 2018-01-05 00:00:00 | 2018-01-05 | t |
7 | {25,26} | vier | 2018-01-07 00:00:00 | 2018-01-07 | f |
9 | {27,28} | fünf | 2018-01-09 00:00:00 | 2018-01-09 | t |
(5 rows)

vijay=# create table example (
vijay(# one INT8,
vijay(# two INT8[],
vijay(# three TEXT,
vijay(# four TIMESTAMP,
vijay(# five DATE,
vijay(# six BOOL,
vijay(# seven FLOAT8)
vijay-# partition by list(three);
CREATE TABLE
vijay=# alter table example attach partition example1 for values in ('foo',
'bar', 'baz', 'uno', 'dos', 'tres');
ALTER TABLE
vijay=# explain analyze select * from example where three = 'foo';
ERROR: could not find pathkey item to sort
vijay=# alter table example1 options (drop sorted);
ALTER TABLE
vijay=# alter table example2 options (drop sorted);
ALTER TABLE
vijay=# explain analyze select * from example where three = 'foo';
QUERY PLAN

-------------------------------------------------------------------------------------------------------
Foreign Scan on example1 (cost=0.00..0.06 rows=1 width=93) (actual
time=0.537..0.912 rows=1 loops=1)
Filter: (three = 'foo'::text)
Rows Removed by Filter: 5
Reader: Single File
Row groups: 1, 2
Planning Time: 0.888 ms
Execution Time: 1.399 ms

--

*Vijaykumar Jain*

Database Engineer

+91 9769545966

vijaykumar(dot)sampat(dot)jain(at)adjust(dot)com <admir(at)adjust(dot)com> | www.adjust.com

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