Fix dist_copy_long test on macOS

On macOS zcat expects the file to end in .Z appending that extension
when the supplied filename does not have it. Leading to the following
error for the dist_copy_long test:

zcat: can't stat: data/prices-10k-random-1.tsv.gz
(data/prices-10k-random-1.tsv.gz.Z): No such file or directory

This patch changes the dist_copy_long test to use the shell to read
the file instead and use input redirection so zcat never sees the
filename.

tsl/test/expected/dist_copy_long.out

@@ -53,28 +53,28 @@ select create_distributed_hypertable('uk_price_paid_space10', 'date', 'postcode2
  (3,public,uk_price_paid_space10,t)
 (1 row)
 
-\copy uk_price_paid_space2 from program 'zcat data/prices-10k-random-1.tsv.gz';
+\copy uk_price_paid_space2 from program 'zcat < data/prices-10k-random-1.tsv.gz';
 select count(*) from uk_price_paid_space2;
  count 
 -------
  10000
 (1 row)
 
-\copy uk_price_paid_space2 from program 'zcat data/prices-10k-random-1.tsv.gz';
+\copy uk_price_paid_space2 from program 'zcat < data/prices-10k-random-1.tsv.gz';
 select count(*) from uk_price_paid_space2;
  count 
 -------
  20000
 (1 row)
 
-\copy uk_price_paid_space10 from program 'zcat data/prices-10k-random-1.tsv.gz';
+\copy uk_price_paid_space10 from program 'zcat < data/prices-10k-random-1.tsv.gz';
 select count(*) from uk_price_paid_space10;
  count 
 -------
  10000
 (1 row)
 
-\copy uk_price_paid_space10 from program 'zcat data/prices-10k-random-1.tsv.gz';
+\copy uk_price_paid_space10 from program 'zcat < data/prices-10k-random-1.tsv.gz';
 select count(*) from uk_price_paid_space10;
  count 
 -------
@@ -82,14 +82,14 @@ select count(*) from uk_price_paid_space10;
 (1 row)
 
 set timescaledb.max_open_chunks_per_insert = 1;
-\copy uk_price_paid from program 'zcat data/prices-100k-random-1.tsv.gz';
+\copy uk_price_paid from program 'zcat < data/prices-100k-random-1.tsv.gz';
 select count(*) from uk_price_paid;
  count  
 --------
  100000
 (1 row)
 
-\copy uk_price_paid from program 'zcat data/prices-100k-random-1.tsv.gz';
+\copy uk_price_paid from program 'zcat < data/prices-100k-random-1.tsv.gz';
 select count(*) from uk_price_paid;
  count  
 --------
@@ -98,14 +98,14 @@ select count(*) from uk_price_paid;
 
 truncate uk_price_paid;
 set timescaledb.max_open_chunks_per_insert = 2;
-\copy uk_price_paid from program 'zcat data/prices-100k-random-1.tsv.gz';
+\copy uk_price_paid from program 'zcat < data/prices-100k-random-1.tsv.gz';
 select count(*) from uk_price_paid;
  count  
 --------
  100000
 (1 row)
 
-\copy uk_price_paid from program 'zcat data/prices-100k-random-1.tsv.gz';
+\copy uk_price_paid from program 'zcat < data/prices-100k-random-1.tsv.gz';
 select count(*) from uk_price_paid;
  count  
 --------
@@ -114,14 +114,14 @@ select count(*) from uk_price_paid;
 
 truncate uk_price_paid;
 set timescaledb.max_open_chunks_per_insert = 1117;
-\copy uk_price_paid from program 'zcat data/prices-100k-random-1.tsv.gz';
+\copy uk_price_paid from program 'zcat < data/prices-100k-random-1.tsv.gz';
 select count(*) from uk_price_paid;
  count  
 --------
  100000
 (1 row)
 
-\copy uk_price_paid from program 'zcat data/prices-100k-random-1.tsv.gz';
+\copy uk_price_paid from program 'zcat < data/prices-100k-random-1.tsv.gz';
 select count(*) from uk_price_paid;
  count  
 --------

tsl/test/sql/dist_copy_long.sql

@@ -32,23 +32,23 @@ create table uk_price_paid_space10(like uk_price_paid);
 select create_distributed_hypertable('uk_price_paid_space10', 'date', 'postcode2', 10, chunk_time_interval => interval '90 day');
 
 
-\copy uk_price_paid_space2 from program 'zcat data/prices-10k-random-1.tsv.gz';
+\copy uk_price_paid_space2 from program 'zcat < data/prices-10k-random-1.tsv.gz';
 select count(*) from uk_price_paid_space2;
-\copy uk_price_paid_space2 from program 'zcat data/prices-10k-random-1.tsv.gz';
+\copy uk_price_paid_space2 from program 'zcat < data/prices-10k-random-1.tsv.gz';
 select count(*) from uk_price_paid_space2;
 
-\copy uk_price_paid_space10 from program 'zcat data/prices-10k-random-1.tsv.gz';
+\copy uk_price_paid_space10 from program 'zcat < data/prices-10k-random-1.tsv.gz';
 select count(*) from uk_price_paid_space10;
-\copy uk_price_paid_space10 from program 'zcat data/prices-10k-random-1.tsv.gz';
+\copy uk_price_paid_space10 from program 'zcat < data/prices-10k-random-1.tsv.gz';
 select count(*) from uk_price_paid_space10;
 
 
 set timescaledb.max_open_chunks_per_insert = 1;
 
-\copy uk_price_paid from program 'zcat data/prices-100k-random-1.tsv.gz';
+\copy uk_price_paid from program 'zcat < data/prices-100k-random-1.tsv.gz';
 select count(*) from uk_price_paid;
 
-\copy uk_price_paid from program 'zcat data/prices-100k-random-1.tsv.gz';
+\copy uk_price_paid from program 'zcat < data/prices-100k-random-1.tsv.gz';
 select count(*) from uk_price_paid;
 
 truncate uk_price_paid;
@@ -56,10 +56,10 @@ truncate uk_price_paid;
 
 set timescaledb.max_open_chunks_per_insert = 2;
 
-\copy uk_price_paid from program 'zcat data/prices-100k-random-1.tsv.gz';
+\copy uk_price_paid from program 'zcat < data/prices-100k-random-1.tsv.gz';
 select count(*) from uk_price_paid;
 
-\copy uk_price_paid from program 'zcat data/prices-100k-random-1.tsv.gz';
+\copy uk_price_paid from program 'zcat < data/prices-100k-random-1.tsv.gz';
 select count(*) from uk_price_paid;
 
 truncate uk_price_paid;
@@ -67,10 +67,10 @@ truncate uk_price_paid;
 
 set timescaledb.max_open_chunks_per_insert = 1117;
 
-\copy uk_price_paid from program 'zcat data/prices-100k-random-1.tsv.gz';
+\copy uk_price_paid from program 'zcat < data/prices-100k-random-1.tsv.gz';
 select count(*) from uk_price_paid;
 
-\copy uk_price_paid from program 'zcat data/prices-100k-random-1.tsv.gz';
+\copy uk_price_paid from program 'zcat < data/prices-100k-random-1.tsv.gz';
 select count(*) from uk_price_paid;
 
 truncate uk_price_paid;