Add tests

Author: kanoshiou

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

@@ -172,3 +172,18 @@ Milky Way
 Milky Way
 Milky Way
 ;
+
+dropAgainWithWildcardAfterEval
+from languages
+| eval language_code = 12, x = 13
+| drop language_code
+| drop language*
+| keep x
+| limit 3
+;
+
+x:integer
+13
+13
+13
+;

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/session/IndexResolverFieldNamesTests.java

@@ -1710,6 +1710,16 @@ public void testEnrichAndJoinMaskingEvalWh() {
             | keep emp_no, language_name""", Set.of("emp_no", "language_name", "languages", "language_name.*", "languages.*", "emp_no.*"));
     }
 
+    public void testDropAgainWithWildcardAfterEval() {
+        assertFieldNames("""
+            from employees
+            | eval full_name = 12
+            | drop full_name
+            | drop *name
+            | keep emp_no
+            """, Set.of("emp_no", "emp_no.*", "*name", "*name.*"));
+    }
+
     private Set<String> fieldNames(String query, Set<String> enrichPolicyMatchFields) {
         var preAnalysisResult = new EsqlSession.PreAnalysisResult(null);
         return EsqlSession.fieldNames(parser.createStatement(query), enrichPolicyMatchFields, preAnalysisResult).fieldNames();