Transforms for jsonb to PL/Perl

Add a new contrib module jsonb_plperl that provides a transform between
jsonb and PL/Perl.  jsonb values are converted to appropriate Perl types
such as arrays and hashes, and vice versa.

Author: Anthony Bykov <[email protected]>
Reviewed-by: Pavel Stehule <[email protected]>
Reviewed-by: Aleksander Alekseev <[email protected]>
Reviewed-by: Nikita Glukhov <[email protected]>

1 files changed, 19 insertions, 0 deletions

diff --git a/contrib/jsonb_plperl/jsonb_plperl--1.0.sql b/contrib/jsonb_plperl/jsonb_plperl--1.0.sql
new file mode 100644
index 00000000000..c7964ba07c2
--- /dev/null
+++ b/contrib/jsonb_plperl/jsonb_plperl--1.0.sql
@@ -0,0 +1,19 @@
+/* contrib/jsonb_plperl/jsonb_plperl--1.0.sql */
+
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION jsonb_plperl" to load this file. \quit
+
+CREATE FUNCTION jsonb_to_plperl(val internal) RETURNS internal
+LANGUAGE C STRICT IMMUTABLE
+AS 'MODULE_PATHNAME';
+
+CREATE FUNCTION plperl_to_jsonb(val internal) RETURNS jsonb
+LANGUAGE C STRICT IMMUTABLE
+AS 'MODULE_PATHNAME';
+
+CREATE TRANSFORM FOR jsonb LANGUAGE plperl (
+    FROM SQL WITH FUNCTION jsonb_to_plperl(internal),
+    TO SQL WITH FUNCTION plperl_to_jsonb(internal)
+);
+
+COMMENT ON TRANSFORM FOR jsonb LANGUAGE plperl IS 'transform between jsonb and Perl';