GH-5691 CLI for running and storing query explanations

Author: hmottestad

core/sail/nativerdf/src/main/java/org/eclipse/rdf4j/sail/nativerdf/wal/ValueStoreWalReader.java

@@ -35,6 +35,7 @@
 import com.fasterxml.jackson.core.JsonFactory;
 import com.fasterxml.jackson.core.JsonParser;
 import com.fasterxml.jackson.core.JsonToken;
+import com.fasterxml.jackson.core.StreamReadConstraints;
 
 /**
  * Reader for ValueStore WAL segments that yields minted records in LSN order across segments. It tolerates truncated or
@@ -47,7 +48,7 @@ public final class ValueStoreWalReader implements AutoCloseable {
 	private static final Logger logger = LoggerFactory.getLogger(ValueStoreWalReader.class);
 
 	private final ValueStoreWalConfig config;
-	private final JsonFactory jsonFactory = new JsonFactory();
+	private final JsonFactory jsonFactory = createJsonFactory();
 	// Streaming iteration state
 	private final List<SegmentEntry> segments;
 	private int segIndex = -1;
@@ -78,6 +79,14 @@ private ValueStoreWalReader(ValueStoreWalConfig config) {
 		this.currentSegmentSummarySeen = false;
 	}
 
+	private static JsonFactory createJsonFactory() {
+		return JsonFactory.builder()
+				.streamReadConstraints(StreamReadConstraints.builder()
+						.maxStringLength(ValueStoreWAL.MAX_FRAME_BYTES)
+						.build())
+				.build();
+	}
+
 	/**
 	 * Create a reader for the given configuration. No I/O is performed until iteration begins.
 	 */