From 412f0ec082c2b99ec6677b3a269f0c2e54d386c9 Mon Sep 17 00:00:00 2001
From: Paul Trowbridge <paul@hptrow.me>
Date: Mon, 11 Jan 2021 11:05:44 -0500
Subject: [PATCH] add column number to facilitate pivoting

---
 db_schema/extract_for_customer_facing.pg.sql | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/db_schema/extract_for_customer_facing.pg.sql b/db_schema/extract_for_customer_facing.pg.sql
index 861d4f3..8092ae6 100644
--- a/db_schema/extract_for_customer_facing.pg.sql
+++ b/db_schema/extract_for_customer_facing.pg.sql
@@ -88,6 +88,7 @@ GROUP BY
         ,pc.branding
         ,pc.accs
         ,pc.suffix
+        ,1 col
         ,pc.pckg1 pckg
         ,pc.vol1_uom vol_uom
     FROM
@@ -99,6 +100,7 @@ GROUP BY
         ,pc.branding
         ,pc.accs
         ,pc.suffix
+        ,2 col
         ,pc.pckg2 pckg
         ,pc.vol2_uom vol_uom
     FROM
@@ -110,6 +112,7 @@ GROUP BY
         ,pc.branding
         ,pc.accs
         ,pc.suffix
+        ,3 col
         ,pc.pckg3 pckg
         ,pc.vol3_uom vol_uom
     FROM
@@ -124,6 +127,8 @@ SELECT
     ,up.accs
     ,up.suffix
     ,up.pckg
+    --retain this column to re-pivot back to original format
+    ,up.col
     ,up.vol_uom
     ,row_number() OVER (PARTITION BY up.stlc, up.coltier, up.branding, up.accs, up.suffix ORDER BY item DESC) seq
     ,item
@@ -138,7 +143,7 @@ FROM
         AND COALESCE(i.SUFFIX,'') = up.suffix
         AND APLNT <> 'I'
 )
-----compile all the conversions into a single json object
+----compile all the conversions into a single json object----------------------
 ,items AS (
     SELECT
         jsonb_agg( DISTINCT 
@@ -154,6 +159,7 @@ FROM
         seq = 1
         AND COALESCE(item,'') <> ''
 )
+--do the conversion-------------------------------------------------------------
 , conversion AS (
     SELECT
         rslt.* 
@@ -161,7 +167,8 @@ FROM
         items 
         JOIN LATERAL rlarp.uom_array(conv) rslt ON true
 )
---SELECT * FROM conversion
+--SELECT * FROM unpivot ORDER BY stlc
+----join conversion back to data initial part link------------------------------
 SELECT 
     i.*
     ,c.*