review comments

Author: flash1293

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

@@ -291,12 +291,23 @@ emp_no:integer | a:keyword                         | b:keyword
 ;
 
 multiPatterns
+required_capability: grok_multi_pattern
 row text = "XYZ extractme" | grok text "ABC %{WORD:foo}","XYZ %{WORD:bar}" | keep foo, bar;
 
 foo:keyword | bar:keyword
 null        | extractme
 ;
 
+multiPatterns2
+required_capability: grok_multi_pattern
+from employees | sort emp_no asc | eval full_name = concat(first_name, " ", last_name) | grok full_name "Georgi %{WORD:georgis_last_name}", "%{WORD:first_name} %{WORD:last_name}" | keep full_name, first_name, last_name, georgis_last_name | limit 3;
+
+full_name:keyword      | first_name:keyword   | last_name:keyword | georgis_last_name:keyword 
+Georgi Facello         | null                 | null              | Facello
+Bezalel Simmel         | Bezalel              | Simmel            | null
+Parto Bamford          | Parto                | Bamford           | null
+;
+
 overwriteInputName
 required_capability: grok_dissect_masking
 row text = "123 abc", int = 5 | sort int asc | grok text "%{NUMBER:text:int} %{WORD:description}" | keep text, int, description;

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/action/EsqlCapabilities.java

@@ -1516,6 +1516,11 @@ public enum Cap {
          */
         FIX_FILTER_ORDINALS,
 
+        /**
+         * Allow multiple patterns for GROK command
+         */
+        GROK_MULTI_PATTERN,
+
         ;
 
         private final boolean enabled;

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/parser/LogicalPlanBuilder.java

@@ -216,9 +216,10 @@ public PlanFactory visitEvalCommand(EsqlBaseParser.EvalCommandContext ctx) {
     public PlanFactory visitGrokCommand(EsqlBaseParser.GrokCommandContext ctx) {
         return p -> {
             Source source = source(ctx);
+            FoldContext patternFoldContext = FoldContext.small(); /* TODO remove me */
             List<String> patterns = ctx.string()
                 .stream()
-                .map(stringContext -> BytesRefs.toString(visitString(stringContext).fold(FoldContext.small() /* TODO remove me */)))
+                .map(stringContext -> BytesRefs.toString(visitString(stringContext).fold(patternFoldContext)))
                 .toList();
 
             String combinePattern = org.elasticsearch.grok.Grok.combinePatterns(patterns);