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zacharymorn commented on code in PR #767:
URL: https://github.com/apache/lucene/pull/767#discussion_r841312352


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lucene/core/src/java/org/apache/lucene/search/FieldExistsQuery.java:
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@@ -0,0 +1,223 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.lucene.search;
+
+import java.io.IOException;
+import java.util.Objects;
+import org.apache.lucene.index.DocValues;
+import org.apache.lucene.index.DocValuesType;
+import org.apache.lucene.index.FieldInfo;
+import org.apache.lucene.index.FieldInfos;
+import org.apache.lucene.index.IndexOptions;
+import org.apache.lucene.index.IndexReader;
+import org.apache.lucene.index.LeafReader;
+import org.apache.lucene.index.LeafReaderContext;
+import org.apache.lucene.index.PointValues;
+import org.apache.lucene.index.Terms;
+
+/**
+ * A {@link Query} that matches documents that contain either a {@link
+ * org.apache.lucene.document.KnnVectorField}, or a field that indexes norms or doc values.
+ */
+public class FieldExistsQuery extends Query {
+ private String field;
+
+ /** Create a query that will match that have a value for the given {@code field}. */
+ public FieldExistsQuery(String field) {
+ this.field = Objects.requireNonNull(field);
+ }
+
+ public String getField() {
+ return field;
+ }
+
+ @Override
+ public String toString(String field) {
+ return "FieldExistsQuery [field=" + this.field + "]";
+ }
+
+ @Override
+ public void visit(QueryVisitor visitor) {
+ if (visitor.acceptField(field)) {
+ visitor.visitLeaf(this);
+ }
+ }
+
+ @Override
+ public boolean equals(Object other) {
+ return sameClassAs(other) && field.equals(((FieldExistsQuery) other).field);
+ }
+
+ @Override
+ public int hashCode() {
+ final int prime = 31;
+ int hash = classHash();
+ hash = prime * hash + field.hashCode();
+ return hash;
+ }
+
+ @Override
+ public Query rewrite(IndexReader reader) throws IOException {
+ boolean allReadersRewritable = true;
+
+ for (LeafReaderContext context : reader.leaves()) {
+ LeafReader leaf = context.reader();
+ FieldInfos fieldInfos = leaf.getFieldInfos();
+ FieldInfo fieldInfo = fieldInfos.fieldInfo(field);
+
+ if (fieldInfo == null) {
+ allReadersRewritable = false;
+ break;
+ }
+
+ if (fieldInfo.hasNorms()) { // the field indexes norms
+ if (reader.getDocCount(field) != reader.maxDoc()) {
+ allReadersRewritable = false;
+ break;
+ }
+ } else if (fieldInfo.getVectorDimension() != 0) { // the field indexes vectors
+ if (leaf.getVectorValues(field).size() != reader.maxDoc()) {
+ allReadersRewritable = false;
+ break;
+ }
+ } else if (fieldInfo.getDocValuesType() != DocValuesType.NONE
+ || leaf.terms(field) != null
+ || leaf.getPointValues(field) != null) { // the field indexes doc values or points

Review Comment:
I gave that a try in https://github.com/apache/lucene/pull/767/commits/d4d9a3f5b79fa778f29c48d5ab0fee43dab14561, but it failed fa few tests (that I fixed), mostly having to do with `BinaryPoint` or `StringField` fields don't pass the condition `fieldInfo.getDocValuesType() != DocValuesType.NONE`. Could you let me know if it looks correct to you ?



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