Add more UTs, including Unicode and ToUpper

Author: julian-elastic

x-pack/plugin/esql/qa/testFixtures/src/main/resources/where-like.csv-spec

@@ -588,6 +588,60 @@ FROM employees
 emp_no:integer | first_name:keyword
 ;
 
+rlikeListWithUpperAllLower
+required_capability: rlike_with_list_of_patterns
+FROM employees 
+| WHERE TO_UPPER(first_name) RLIKE ("geor.*", "wei.*") 
+| KEEP emp_no, first_name 
+| SORT emp_no;
+
+emp_no:integer | first_name:keyword
+;
+
+rlikeListWithUpperAllUpper
+required_capability: rlike_with_list_of_patterns
+FROM employees 
+| WHERE TO_UPPER(first_name) RLIKE ("GEOR.*", "WEI.*")
+| KEEP emp_no, first_name 
+| SORT emp_no;
+
+emp_no:integer | first_name:keyword
+10001          | Georgi
+10040          | Weiyi
+10055          | Georgy
+;
+
+rlikeListWithUpperMixedCase
+required_capability: rlike_with_list_of_patterns
+FROM employees 
+| WHERE TO_UPPER(first_name) RLIKE ("GeOr.*", "wEiY.*", "bErNi")
+| KEEP emp_no, first_name 
+| SORT emp_no;
+
+emp_no:integer | first_name:keyword
+;
+
+rlikeListWithUpperMultiplePatternsMixedCase
+required_capability: rlike_with_list_of_patterns
+FROM employees 
+| WHERE TO_UPPER(first_name) RLIKE ("geor*", "WEIYI.*", "bErnI.*") 
+| KEEP emp_no, first_name 
+| SORT emp_no;
+
+emp_no:integer | first_name:keyword
+10040          | Weiyi
+;
+
+rlikeListWithUpperNoMatch
+required_capability: rlike_with_list_of_patterns
+FROM employees 
+| WHERE TO_UPPER(first_name) RLIKE ("notaname.*") 
+| KEEP emp_no, first_name 
+| SORT emp_no;
+
+emp_no:integer | first_name:keyword
+;
+
 rlikeListEmptyArgWildcard
 required_capability: rlike_with_list_of_patterns
 FROM employees 
@@ -1390,3 +1444,26 @@ ROW x = "abc" | EVAL bool = x RLIKE "#"
 x:keyword | bool:boolean
 abc       | false
 ;
+
+rlikeWithLowerTurnedInsensitiveUnicode#[skip:-8.12.99]
+FROM airport_city_boundaries
+| WHERE TO_UPPER(region) RLIKE ".*Л.*" and abbrev == "FRU"
+| KEEP region
+| LIMIT 1
+;
+
+region:text
+Свердлов району
+;
+
+rlikeListWithLowerTurnedInsensitiveUnicode
+required_capability: rlike_with_list_of_patterns
+FROM airport_city_boundaries
+| WHERE TO_UPPER(region) RLIKE (".*Л.*", ".*NOT EXISTS.*") and abbrev == "FRU"
+| KEEP region
+| LIMIT 1
+;
+
+region:text
+Свердлов району
+;

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/optimizer/LocalLogicalPlanOptimizerTests.java

@@ -677,7 +677,7 @@ public void testReplaceUpperStringCasinqgWithInsensitiveRLike() {
 
     /*
      *Limit[1000[INTEGER],false]
-     * \_Filter[RLikeList(first_name{f}#4, "("VALÜ*", "VALÜAA*")", true)]
+     * \_Filter[RLikeList(first_name{f}#4, "("VALÜ*", "TEST*")", true)]
      *  \_EsRelation[test][_meta_field{f}#9, emp_no{f}#3, first_name{f}#4, gen..]
      */
     public void testReplaceUpperStringCasinqWithInsensitiveRLikeList() {