This querry is particularly problamatic when there are OR conditions due
to shared docs.
```sql
ANALYZE SELECT `tabAddress`.name,
`tabAddress`.city,
`tabAddress`.country
FROM `tabAddress`
join `tabDynamic Link` on (`tabDynamic Link`.parent = `tabAddress`.name AND `tabDynamic Link`.parenttype = 'Address')
WHERE
`tabDynamic Link`.link_doctype = 'Customer'
AND `tabDynamic Link`.link_name = 'CUSTOMER NAME'
AND coalesce(`tabAddress`.disabled, 0) = 0
AND (`tabAddress`.`country` like '%%'
OR `tabAddress`.`state` like '%%'
OR `tabAddress`.`name` like '%%'
OR `tabAddress`.`name` like '%%')
AND ((((coalesce(`tabAddress`.`branch`, '')=''
OR `tabAddress`.`branch` in ('something')))))
OR (`tabAddress`.name in ('SOME SHARED DOC'))
ORDER BY if(locate('', `tabAddress`.name), locate('', `tabAddress`.name), 99999),
`tabAddress`.idx DESC,
`tabAddress`.name
LIMIT 0, 20;
```
**Before:** Never terminates and reads entire table with millions of lines :LOL:
**After:** Reads ~100 rows max.
```
*************************** 1. row ***************************
id: 1
select_type: SIMPLE
table: tabDynamic Link
type: index_merge
possible_keys: parent,link_doctype_link_name_index,link_name
key: link_name,link_doctype_link_name_index,parent
key_len: 563,1126,563
ref: NULL
rows: 40
r_rows: 79.00
filtered: 100.00
r_filtered: 100.00
Extra: Using union(intersect(link_name,link_doctype_link_name_index),parent); Using where; Using temporary; Using filesort
*************************** 2. row ***************************
id: 1
select_type: SIMPLE
table: tabAddress
type: eq_ref
possible_keys: PRIMARY,selco_branch
key: PRIMARY
key_len: 562
ref: _900a733bdc3bb9ed.tabDynamic Link.parent
rows: 1
r_rows: 1.00
filtered: 100.00
r_filtered: 100.00
Extra: Using where
2 rows in set (0.001 sec)
```
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