ESQL: add =~ operator (case insensitive equality)

x-pack/plugin/esql/qa/testFixtures/src/main/resources/ignore-case.csv-spec

@@ -0,0 +1,63 @@
+
+simpleFilter#[skip:-8.12.99, reason:case insensitive operators implemented in v 8.13]
+from employees | where first_name =~ "mary" | keep emp_no, first_name, last_name;
+
+emp_no:integer | first_name:keyword | last_name:keyword
+10011          | Mary               | Sluis
+;
+
+
+simpleFilterUpper#[skip:-8.12.99, reason:case insensitive operators implemented in v 8.13]
+from employees | where first_name =~ "MARY" | keep emp_no, first_name, last_name;
+
+emp_no:integer | first_name:keyword | last_name:keyword
+10011          | Mary               | Sluis
+;
+
+simpleFilterPartial#[skip:-8.12.99, reason:case insensitive operators implemented in v 8.13]
+from employees | where first_name =~ "mar" | keep emp_no, first_name, last_name;
+
+emp_no:integer | first_name:keyword | last_name:keyword
+;
+
+mixedConditionsAnd#[skip:-8.12.99, reason:case insensitive operators implemented in v 8.13]
+from employees | where first_name =~ "mary" AND emp_no == 10011 | keep emp_no, first_name, last_name;
+
+emp_no:integer | first_name:keyword | last_name:keyword
+10011          | Mary               | Sluis
+;
+
+
+mixedConditionsOr#[skip:-8.12.99, reason:case insensitive operators implemented in v 8.13]
+from employees | where first_name =~ "mary" OR emp_no == 10001 | keep emp_no, first_name, last_name |sort emp_no;
+
+emp_no:integer | first_name:keyword | last_name:keyword
+10001          | Georgi             | Facello
+10011          | Mary               | Sluis
+;
+
+
+evalEquals#[skip:-8.12.99, reason:case insensitive operators implemented in v 8.13]
+from employees | where emp_no == 10001 
+| eval a = first_name =~ "georgi", b = first_name == "georgi", c = first_name =~ "GEORGI", d = first_name =~ "Geor", e = first_name =~ "GeoRgI" 
+| keep emp_no, first_name, a, b, c, d, e;
+
+emp_no:integer | first_name:keyword | a:boolean | b:boolean | c:boolean | d:boolean | e:boolean
+10001          | Georgi             | true      | false     | true      | false     | true
+;
+
+
+filterNumeric#[skip:-8.12.99, reason:case insensitive operators implemented in v 8.13]
+from employees | where emp_no =~ 10001 | keep emp_no, first_name, last_name;
+
+emp_no:integer | first_name:keyword | last_name:keyword
+10001          | Georgi               | Facello
+;
+
+
+constantsAndFolding#[skip:-8.12.99, reason:case insensitive operators implemented in v 8.13]
+row name = "foobar" | where "FoObAr" =~ name;
+
+name:keyword
+foobar
+;

x-pack/plugin/esql/src/main/antlr/EsqlBaseLexer.g4

@@ -130,6 +130,7 @@ RP : ')';
 TRUE : 'true';
 
 EQ  : '==';
+SEQ  : '=~';
 NEQ : '!=';
 LT  : '<';
 LTE : '<=';

x-pack/plugin/esql/src/main/antlr/EsqlBaseLexer.tokens

@@ -0,0 +1,159 @@
+DISSECT=1
+DROP=2
+ENRICH=3
+EVAL=4
+EXPLAIN=5
+FROM=6
+GROK=7
+INLINESTATS=8
+KEEP=9
+LIMIT=10
+MV_EXPAND=11
+PROJECT=12
+RENAME=13
+ROW=14
+SHOW=15
+SORT=16
+STATS=17
+WHERE=18
+UNKNOWN_CMD=19
+LINE_COMMENT=20
+MULTILINE_COMMENT=21
+WS=22
+EXPLAIN_WS=23
+EXPLAIN_LINE_COMMENT=24
+EXPLAIN_MULTILINE_COMMENT=25
+PIPE=26
+STRING=27
+INTEGER_LITERAL=28
+DECIMAL_LITERAL=29
+BY=30
+AND=31
+ASC=32
+ASSIGN=33
+COMMA=34
+DESC=35
+DOT=36
+FALSE=37
+FIRST=38
+LAST=39
+LP=40
+IN=41
+IS=42
+LIKE=43
+NOT=44
+NULL=45
+NULLS=46
+OR=47
+PARAM=48
+RLIKE=49
+RP=50
+TRUE=51
+EQ=52
+SEQ=53
+NEQ=54
+LT=55
+LTE=56
+GT=57
+GTE=58
+PLUS=59
+MINUS=60
+ASTERISK=61
+SLASH=62
+PERCENT=63
+OPENING_BRACKET=64
+CLOSING_BRACKET=65
+UNQUOTED_IDENTIFIER=66
+QUOTED_IDENTIFIER=67
+EXPR_LINE_COMMENT=68
+EXPR_MULTILINE_COMMENT=69
+EXPR_WS=70
+METADATA=71
+FROM_UNQUOTED_IDENTIFIER=72
+FROM_LINE_COMMENT=73
+FROM_MULTILINE_COMMENT=74
+FROM_WS=75
+PROJECT_UNQUOTED_IDENTIFIER=76
+PROJECT_LINE_COMMENT=77
+PROJECT_MULTILINE_COMMENT=78
+PROJECT_WS=79
+AS=80
+RENAME_LINE_COMMENT=81
+RENAME_MULTILINE_COMMENT=82
+RENAME_WS=83
+ON=84
+WITH=85
+ENRICH_LINE_COMMENT=86
+ENRICH_MULTILINE_COMMENT=87
+ENRICH_WS=88
+ENRICH_FIELD_LINE_COMMENT=89
+ENRICH_FIELD_MULTILINE_COMMENT=90
+ENRICH_FIELD_WS=91
+MVEXPAND_LINE_COMMENT=92
+MVEXPAND_MULTILINE_COMMENT=93
+MVEXPAND_WS=94
+INFO=95
+FUNCTIONS=96
+SHOW_LINE_COMMENT=97
+SHOW_MULTILINE_COMMENT=98
+SHOW_WS=99
+'dissect'=1
+'drop'=2
+'enrich'=3
+'eval'=4
+'explain'=5
+'from'=6
+'grok'=7
+'inlinestats'=8
+'keep'=9
+'limit'=10
+'mv_expand'=11
+'project'=12
+'rename'=13
+'row'=14
+'show'=15
+'sort'=16
+'stats'=17
+'where'=18
+'|'=26
+'by'=30
+'and'=31
+'asc'=32
+'='=33
+','=34
+'desc'=35
+'.'=36
+'false'=37
+'first'=38
+'last'=39
+'('=40
+'in'=41
+'is'=42
+'like'=43
+'not'=44
+'null'=45
+'nulls'=46
+'or'=47
+'?'=48
+'rlike'=49
+')'=50
+'true'=51
+'=='=52
+'=~'=53
+'!='=54
+'<'=55
+'<='=56
+'>'=57
+'>='=58
+'+'=59
+'-'=60
+'*'=61
+'/'=62
+'%'=63
+']'=65
+'metadata'=71
+'as'=80
+'on'=84
+'with'=85
+'info'=95
+'functions'=96

x-pack/plugin/esql/src/main/antlr/EsqlBaseParser.g4

@@ -229,7 +229,7 @@ string
     ;
 
 comparisonOperator
-    : EQ | NEQ | LT | LTE | GT | GTE
+    : EQ | SEQ | NEQ | LT | LTE | GT | GTE
     ;
 
 explainCommand