Prevent unnamed fields

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

@@ -87,6 +87,14 @@ field
     : (qualifiedName ASSIGN)? booleanExpression
     ;
 
+rerankFields
+    : rerankField (COMMA rerankField)*
+    ;
+
+rerankField
+    : qualifiedName (ASSIGN booleanExpression)?
+    ;
+
 fromCommand
     : FROM indexPatternAndMetadataFields
     ;
@@ -296,7 +304,7 @@ rrfCommand
    ;
 
 rerankCommand
-    : DEV_RERANK queryText=constant ON fields WITH inferenceId=identifierOrParameter
+    : DEV_RERANK queryText=constant ON rerankFields WITH inferenceId=identifierOrParameter
     ;
 
 completionCommand

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

@@ -826,6 +826,25 @@ public List<Alias> visitFields(EsqlBaseParser.FieldsContext ctx) {
         return ctx != null ? visitList(this, ctx.field(), Alias.class) : new ArrayList<>();
     }
 
+    @Override
+    public Alias visitRerankField(EsqlBaseParser.RerankFieldContext ctx) {
+        return visitRerankField(ctx, source(ctx));
+    }
+
+    private Alias visitRerankField(EsqlBaseParser.RerankFieldContext ctx, Source source) {
+        UnresolvedAttribute id = visitQualifiedName(ctx.qualifiedName());
+        assert id != null;
+
+        var boolExprCtx = ctx.booleanExpression();
+        Expression value = boolExprCtx == null ? id : expression(boolExprCtx);
+        return new Alias(source, id.name(), value);
+    }
+
+    @Override
+    public List<Alias> visitRerankFields(EsqlBaseParser.RerankFieldsContext ctx) {
+        return ctx != null ? visitList(this, ctx.rerankField(), Alias.class) : new ArrayList<>();
+    }
+
     @Override
     public NamedExpression visitAggField(EsqlBaseParser.AggFieldContext ctx) {
         Source source = source(ctx);

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

@@ -731,7 +731,7 @@ public PlanFactory visitRerankCommand(EsqlBaseParser.RerankCommandContext ctx) {
             );
         }
 
-        return p -> new Rerank(source, p, inferenceId(ctx.inferenceId), queryText, visitFields(ctx.fields()));
+        return p -> new Rerank(source, p, inferenceId(ctx.inferenceId), queryText, visitRerankFields(ctx.rerankFields()));
     }
 
     @Override

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/analysis/AnalyzerTests.java

@@ -3613,6 +3613,19 @@ public void testResolveRerankFields() {
             assertThat(rerank.scoreAttribute(), equalTo(getAttributeByName(relation.output(), MetadataAttribute.SCORE)));
         }
 
+        {
+            // Unnamed field.
+            try {
+                LogicalPlan plan = analyze("""
+                    FROM books METADATA _score
+                    | WHERE title:"food"
+                    | RERANK "food" ON title, SUBSTRING(description, 0, 100), yearRenamed=year WITH `reranking-inference-id`
+                    """, "mapping-books.json");
+            } catch (ParsingException ex) {
+                assertThat(ex.getMessage(), containsString("line 3:36: mismatched input '(' expecting {'=', ',', '.', 'with'}"));
+            }
+        }
+
         {
             VerificationException ve = expectThrows(
                 VerificationException.class,

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/parser/StatementParserTests.java

@@ -3420,7 +3420,7 @@ public void testInvalidRerank() {
 
         expectError("FROM foo* | RERANK \"query text\" WITH inferenceId", "line 1:33: mismatched input 'WITH' expecting 'on'");
 
-        expectError("FROM foo* | RERANK \"query text\" ON title", "line 1:41: mismatched input '<EOF>' expecting {'and',");
+        expectError("FROM foo* | RERANK \"query text\" ON title", "line 1:41: mismatched input '<EOF>' expecting {'=', ',', '.', 'with'}");
     }
 
     public void testCompletionUsingFieldAsPrompt() {

x-pack/plugin/kql/src/main/java/org/elasticsearch/xpack/kql/parser/KqlBase.interp

@@ -57,4 +57,4 @@ fieldName
 
 
 atn:
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15, 11, 15, 12, 15, 143, 1, 15, 3, 15, 147, 8, 15, 1, 15, 1, 15, 3, 15, 151, 8, 15, 1, 15, 1, 15, 3, 15, 155, 8, 15, 1, 15, 3, 15, 158, 8, 15, 1, 16, 1, 16, 1, 16, 3, 16, 163, 8, 16, 1, 16, 0, 2, 2, 10, 17, 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 0, 4, 1, 0, 2, 3, 1, 0, 6, 9, 2, 0, 14, 14, 16, 16, 1, 0, 2, 4, 177, 0, 35, 1, 0, 0, 0, 2, 39, 1, 0, 0, 0, 4, 58, 1, 0, 0, 0, 6, 60, 1, 0, 0, 0, 8, 63, 1, 0, 0, 0, 10, 69, 1, 0, 0, 0, 12, 86, 1, 0, 0, 0, 14, 88, 1, 0, 0, 0, 16, 94, 1, 0, 0, 0, 18, 98, 1, 0, 0, 0, 20, 102, 1, 0, 0, 0, 22, 112, 1, 0, 0, 0, 24, 114, 1, 0, 0, 0, 26, 128, 1, 0, 0, 0, 28, 135, 1, 0, 0, 0, 30, 157, 1, 0, 0, 0, 32, 162, 1, 0, 0, 0, 34, 36, 3, 2, 1, 0, 35, 34, 1, 0, 0, 0, 35, 36, 1, 0, 0, 0, 36, 37, 1, 0, 0, 0, 37, 38, 5, 0, 0, 1, 38, 1, 1, 0, 0, 0, 39, 40, 6, 1, -1, 0, 40, 41, 3, 4, 2, 0, 41, 47, 1, 0, 0, 0, 42, 43, 10, 2, 0, 0, 43, 44, 7, 0, 0, 0, 44, 46, 3, 2, 1, 2, 45, 42, 1, 0, 0, 0, 46, 49, 1, 0, 0, 0, 47, 45, 1, 0, 0, 0, 47, 48, 1, 0, 0, 0, 48, 3, 1, 0, 0, 0, 49, 47, 1, 0, 0, 0, 50, 59, 3, 6, 3, 0, 51, 59, 3, 8, 4, 0, 52, 59, 3, 18, 9, 0, 53, 59, 3, 16, 8, 0, 54, 59, 3, 24, 12, 0, 55, 59, 3, 20, 10, 0, 56, 59, 3, 26, 13, 0, 57, 59, 3, 28, 14, 0, 58, 50, 1, 0, 0, 0, 58, 51, 1, 0, 0, 0, 58, 52, 1, 0, 0, 0, 58, 53, 1, 0, 0, 0, 58, 54, 1, 0, 0, 0, 58, 55, 1, 0, 0, 0, 58, 56, 1, 0, 0, 0, 58, 57, 1, 0, 0, 0, 59, 5, 1, 0, 0, 0, 60, 61, 5, 4, 0, 0, 61, 62, 3, 4, 2, 0, 62, 7, 1, 0, 0, 0, 63, 64, 3, 32, 16, 0, 64, 65, 5, 5, 0, 0, 65, 66, 5, 12, 0, 0, 66, 67, 3, 10, 5, 0, 67, 68, 5, 13, 0, 0, 68, 9, 1, 0, 0, 0, 69, 70, 6, 5, -1, 0, 70, 71, 3, 12, 6, 0, 71, 77, 1, 0, 0, 0, 72, 73, 10, 2, 0, 0, 73, 74, 7, 0, 0, 0, 74, 76, 3, 10, 5, 2, 75, 72, 1, 0, 0, 0, 76, 79, 1, 0, 0, 0, 77, 75, 1, 0, 0, 0, 77, 78, 1, 0, 0, 0, 78, 11, 1, 0, 0, 0, 79, 77, 1, 0, 0, 0, 80, 87, 3, 6, 3, 0, 81, 87, 3, 8, 4, 0, 82, 87, 3, 14, 7, 0, 83, 87, 3, 24, 12, 0, 84, 87, 3, 20, 10, 0, 85, 87, 3, 26, 13, 0, 86, 80, 1, 0, 0, 0, 86, 81, 1, 0, 0, 0, 86, 82, 1, 0, 0, 0, 86, 83, 1, 0, 0, 0, 86, 84, 1, 0, 0, 0, 86, 85, 1, 0, 0, 0, 87, 13, 1, 0, 0, 0, 88, 89, 5, 10, 0, 0, 89, 90, 3, 10, 5, 0, 90, 91, 5, 11, 0, 0, 91, 15, 1, 0, 0, 0, 92, 93, 5, 16, 0, 0, 93, 95, 5, 5, 0, 0, 94, 92, 1, 0, 0, 0, 94, 95, 1, 0, 0, 0, 95, 96, 1, 0, 0, 0, 96, 97, 5, 16, 0, 0, 97, 17, 1, 0, 0, 0, 98, 99, 5, 10, 0, 0, 99, 100, 3, 2, 1, 0, 100, 101, 5, 11, 0, 0, 101, 19, 1, 0, 0, 0, 102, 103, 3, 32, 16, 0, 103, 104, 7, 1, 0, 0, 104, 105, 3, 22, 11, 0, 105, 21, 1, 0, 0, 0, 106, 108, 7, 2, 0, 0, 107, 106, 1, 0, 0, 0, 108, 109, 1, 0, 0, 0, 109, 107, 1, 0, 0, 0, 109, 110, 1, 0, 0, 0, 110, 113, 1, 0, 0, 0, 111, 113, 5, 15, 0, 0, 112, 107, 1, 0, 0, 0, 112, 111, 1, 0, 0, 0, 113, 23, 1, 0, 0, 0, 114, 115, 3, 32, 16, 0, 115, 116, 5, 5, 0, 0, 116, 117, 5, 16, 0, 0, 117, 25, 1, 0, 0, 0, 118, 119, 3, 32, 16, 0, 119, 120, 5, 5, 0, 0, 120, 121, 3, 30, 15, 0, 121, 129, 1, 0, 0, 0, 122, 123, 3, 32, 16, 0, 123, 124, 5, 5, 0, 0, 124, 125, 5, 10, 0, 0, 125, 126, 3, 30, 15, 0, 126, 127, 5, 11, 0, 0, 127, 129, 1, 0, 0, 0, 128, 118, 1, 0, 0, 0, 128, 122, 1, 0, 0, 0, 129, 27, 1, 0, 0, 0, 130, 136, 3, 30, 15, 0, 131, 132, 5, 10, 0, 0, 132, 133, 3, 30, 15, 0, 133, 134, 5, 11, 0, 0, 134, 136, 1, 0, 0, 0, 135, 130, 1, 0, 0, 0, 135, 131, 1, 0, 0, 0, 136, 29, 1, 0, 0, 0, 137, 139, 7, 3, 0, 0, 138, 137, 1, 0, 0, 0, 138, 139, 1, 0, 0, 0, 139, 141, 1, 0, 0, 0, 140, 142, 7, 2, 0, 0, 141, 140, 1, 0, 0, 0, 142, 143, 1, 0, 0, 0, 143, 141, 1, 0, 0, 0, 143, 144, 1, 0, 0, 0, 144, 146, 1, 0, 0, 0, 145, 147, 7, 3, 0, 0, 146, 145, 1, 0, 0, 0, 146, 147, 1, 0, 0, 0, 147, 158, 1, 0, 0, 0, 148, 150, 7, 0, 0, 0, 149, 151, 7, 3, 0, 0, 150, 149, 1, 0, 0, 0, 150, 151, 1, 0, 0, 0, 151, 158, 1, 0, 0, 0, 152, 154, 5, 4, 0, 0, 153, 155, 7, 0, 0, 0, 154, 153, 1, 0, 0, 0, 154, 155, 1, 0, 0, 0, 155, 158, 1, 0, 0, 0, 156, 158, 5, 15, 0, 0, 157, 138, 1, 0, 0, 0, 157, 148, 1, 0, 0, 0, 157, 152, 1, 0, 0, 0, 157, 156, 1, 0, 0, 0, 158, 31, 1, 0, 0, 0, 159, 163, 5, 14, 0, 0, 160, 163, 5, 15, 0, 0, 161, 163, 5, 16, 0, 0, 162, 159, 1, 0, 0, 0, 162, 160, 1, 0, 0, 0, 162, 161, 1, 0, 0, 0, 163, 33, 1, 0, 0, 0, 17, 35, 47, 58, 77, 86, 94, 109, 112, 128, 135, 138, 143, 146, 150, 154, 157, 162]
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0, 161, 164, 5, 15, 0, 0, 162, 164, 5, 16, 0, 0, 163, 160, 1, 0, 0, 0, 163, 161, 1, 0, 0, 0, 163, 162, 1, 0, 0, 0, 164, 33, 1, 0, 0, 0, 17, 35, 47, 58, 77, 87, 95, 110, 113, 129, 136, 139, 144, 147, 151, 155, 158, 163]