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645929c545
Bring this transform function into sync with the policy established
by commit 3a382983d.
Also, fix it to make sure that what it drills down to is indeed a
hash, and not some other kind of Perl SV. Previously, the test
cases added here provoked crashes.
Because of the crash hazard, back-patch to 9.5 where this module
was introduced.
Discussion: https://postgr.es/m/28336.1528393969@sss.pgh.pa.us
68 lines
1.9 KiB
Plaintext
68 lines
1.9 KiB
Plaintext
CREATE EXTENSION hstore;
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CREATE EXTENSION plperl;
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CREATE EXTENSION hstore_plperl;
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SELECT transforms.udt_schema, transforms.udt_name,
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routine_schema, routine_name,
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group_name, transform_type
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FROM information_schema.transforms JOIN information_schema.routines
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USING (specific_catalog, specific_schema, specific_name)
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ORDER BY 1, 2, 5, 6;
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udt_schema | udt_name | routine_schema | routine_name | group_name | transform_type
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------------+----------+----------------+------------------+------------+----------------
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public | hstore | public | hstore_to_plperl | plperl | FROM SQL
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public | hstore | public | plperl_to_hstore | plperl | TO SQL
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(2 rows)
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-- test perl -> hstore
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CREATE FUNCTION test2() RETURNS hstore
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LANGUAGE plperl
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TRANSFORM FOR TYPE hstore
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AS $$
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$val = {a => 1, b => 'boo', c => undef};
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return $val;
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$$;
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SELECT test2();
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test2
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---------------------------------
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"a"=>"1", "b"=>"boo", "c"=>NULL
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(1 row)
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-- test perl -> hstore[]
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CREATE FUNCTION test2arr() RETURNS hstore[]
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LANGUAGE plperl
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TRANSFORM FOR TYPE hstore
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AS $$
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$val = [{a => 1, b => 'boo', c => undef}, {d => 2}];
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return $val;
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$$;
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SELECT test2arr();
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test2arr
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--------------------------------------------------------------
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{"\"a\"=>\"1\", \"b\"=>\"boo\", \"c\"=>NULL","\"d\"=>\"2\""}
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(1 row)
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-- check error cases
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CREATE OR REPLACE FUNCTION test2() RETURNS hstore
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LANGUAGE plperl
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TRANSFORM FOR TYPE hstore
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AS $$
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return 42;
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$$;
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SELECT test2();
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ERROR: cannot transform non-hash Perl value to hstore
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CONTEXT: PL/Perl function "test2"
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CREATE OR REPLACE FUNCTION test2() RETURNS hstore
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LANGUAGE plperl
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TRANSFORM FOR TYPE hstore
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AS $$
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return [1, 2];
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$$;
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SELECT test2();
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ERROR: cannot transform non-hash Perl value to hstore
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CONTEXT: PL/Perl function "test2"
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DROP FUNCTION test2();
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DROP FUNCTION test2arr();
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DROP EXTENSION hstore_plperl;
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DROP EXTENSION hstore;
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DROP EXTENSION plperl;
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