fix ilike performance, make conditional (#221)

Co-authored-by: Drini Cami <cdrini@gmail.com>

infogami/infobase/dbstore.py

@@ -290,8 +290,8 @@ def process(c, ordering_func=None):
                     # Raise StopIteration to indicate empty result.
                     raise StopIteration
                 c.value = metadata.id
-            if c.op == '~':
-                op = Literal('ILIKE')
+            if c.op in ['~', '~i']:
+                op = Literal('ILIKE' if c.op == '~i' else 'LIKE')
                 # Asterisks as part of the author's name query from patron input are escaped in Open Library
                 # so they don't become % wild card searches. E.g. an author styled as "Muñ*z" shouldn't have
                 # their "*" become a wild card. Other wild cards added by code should be converted to %, though.

infogami/infobase/readquery.py

@@ -239,7 +239,7 @@ def parse_key(key):
     >>> parse_key('foo!=')
     ('foo', '!=')
     """
-    operators = ["!=", "=", "<", "<=", ">=", ">", "~"]
+    operators = ["!=", "=", "<", "<=", ">=", ">", "~", "~i"]
     operator = "="
     for op in operators:
         if key.endswith(op):