ESQL: Block loader for pushing LENGTH

server/src/main/java/org/elasticsearch/index/mapper/BlockLoader.java

@@ -13,6 +13,7 @@
 import org.apache.lucene.index.SortedDocValues;
 import org.apache.lucene.index.SortedSetDocValues;
 import org.apache.lucene.util.BytesRef;
+import org.elasticsearch.common.breaker.CircuitBreakingException;
 import org.elasticsearch.core.Nullable;
 import org.elasticsearch.core.Releasable;
 import org.elasticsearch.index.mapper.blockloader.docvalues.BlockDocValuesReader;
@@ -377,6 +378,13 @@ interface Docs {
      * also a test implementation, but there may be no more other implementations.
      */
     interface BlockFactory {
+        /**
+         * Adjust the circuit breaker with the given delta, if the delta is negative, the breaker will
+         * be adjusted without tripping.
+         * @throws CircuitBreakingException if the breaker was put above its limit
+         */
+        void adjustBreaker(long delta) throws CircuitBreakingException;
+
         /**
          * Build a builder to load booleans as loaded from doc values. Doc values
          * load booleans in sorted order.
@@ -486,6 +494,12 @@ interface BlockFactory {
          */
         Block constantBytes(BytesRef value, int count);
 
+        /**
+         * Build a block that contains {@code value} repeated
+         * {@code count} times.
+         */
+        Block constantInt(int value, int count);
+
         /**
          * Build a reader for reading {@link SortedDocValues}
          */