Remove shared index entries (#3138)

Author: schmidt-sebastian

firebase-firestore/src/main/java/com/google/firebase/firestore/local/SQLiteIndexManager.java

@@ -68,7 +68,7 @@ final class SQLiteIndexManager implements IndexManager {
 
   private final SQLitePersistence db;
   private final LocalSerializer serializer;
-  private final User user;
+  private final String uid;
   private final Map<String, Map<Integer, FieldIndex>> memoizedIndexes;
 
   private boolean started = false;
@@ -77,7 +77,7 @@ final class SQLiteIndexManager implements IndexManager {
   SQLiteIndexManager(SQLitePersistence persistence, LocalSerializer serializer, User user) {
     this.db = persistence;
     this.serializer = serializer;
-    this.user = user;
+    this.uid = user.isAuthenticated() ? user.getUid() : "";
     this.memoizedIndexes = new HashMap<>();
   }
 
@@ -376,7 +376,7 @@ private void addSingleEntry(
         "INSERT INTO index_entries (index_id, uid, array_value, directional_value, document_name) "
             + "VALUES(?, ?, ?, ?, ?)",
         indexId,
-        document.hasLocalMutations() ? user.getUid() : null,
+        uid,
         arrayValue,
         directionalValue,
         document.getKey().toString());
@@ -450,7 +450,7 @@ private SQLitePersistence.Query generateQuery(
     // and an upper bound.
     StringBuilder statement = new StringBuilder();
     statement.append("SELECT document_name, directional_value FROM index_entries ");
-    statement.append("WHERE index_id = ?  AND (uid IS NULL or uid = ?) ");
+    statement.append("WHERE index_id = ? AND uid = ? ");
     if (arrayValues != null) {
       statement.append("AND array_value = ? ");
     }
@@ -504,7 +504,7 @@ private Object[] fillBounds(
     int offset = 0;
     for (int i = 0; i < statementCount; ++i) {
       bindArgs[offset++] = indexId;
-      bindArgs[offset++] = user.getUid();
+      bindArgs[offset++] = uid;
       if (arrayValues != null) {
         bindArgs[offset++] = encodeSingleElement(arrayValues.get(i / statementsPerArrayValue));
       }