Add a DEFAULT option to COPY FROM

This allows for a string which if an input field matches causes the
column's default value to be inserted. The advantage of this is that
the default can be inserted in some rows and not others, for which
non-default data is available.

The file_fdw extension is also modified to take allow use of this
option.

Israel Barth Rubio

Discussion: https://postgr.es/m/CAO_rXXAcqesk6DsvioOZ5zmeEmpUN5ktZf-9=9yu+DTr0Xr8Uw@mail.gmail.com

1 files changed, 25 insertions, 0 deletions

diff --git a/src/bin/psql/t/001_basic.pl b/src/bin/psql/t/001_basic.pl
index 0167cb58a2e..0f394420b26 100644
--- a/src/bin/psql/t/001_basic.pl
+++ b/src/bin/psql/t/001_basic.pl
@@ -325,4 +325,29 @@ is($row_count, '10',
 	'client-side error commits transaction, no ON_ERROR_STOP and multiple -c switches'
 );
 
+# Test \copy from with DEFAULT option
+$node->safe_psql(
+	'postgres',
+	"CREATE TABLE copy_default (
+		id integer PRIMARY KEY,
+		text_value text NOT NULL DEFAULT 'test',
+		ts_value timestamp without time zone NOT NULL DEFAULT '2022-07-05'
+	)"
+);
+
+my $copy_default_sql_file = "$tempdir/copy_default.csv";
+append_to_file($copy_default_sql_file, "1,value,2022-07-04\n");
+append_to_file($copy_default_sql_file, "2,placeholder,2022-07-03\n");
+append_to_file($copy_default_sql_file, "3,placeholder,placeholder\n");
+
+psql_like(
+	$node,
+	"\\copy copy_default from $copy_default_sql_file with (format 'csv', default 'placeholder');
+	SELECT * FROM copy_default",
+	qr/1\|value\|2022-07-04 00:00:00
+2|test|2022-07-03 00:00:00
+3|test|2022-07-05 00:00:00/,
+	'\copy from with DEFAULT'
+);
+
 done_testing();