Copy cartodb lib/sql scripts from CDB_CartodbfyTable branch

scripts-available/CDB_DateToNumber.sql

@@ -0,0 +1,15 @@
+-- Convert timestamp to double precision
+--
+CREATE OR REPLACE FUNCTION CDB_DateToNumber(input timestamp)
+RETURNS double precision AS $$
+DECLARE output double precision DEFAULT NULL;
+BEGIN
+    BEGIN
+        SELECT extract (EPOCH FROM input) INTO output;
+    EXCEPTION WHEN OTHERS THEN
+        RETURN NULL;
+    END;
+RETURN output;
+END;
+$$
+LANGUAGE 'plpgsql' STABLE STRICT;