Allow null new label for map processor.

Author: YaytayAtWork

query-engine/docs/query-engine-compose.yml

@@ -59,7 +59,7 @@ services:
     - 14268:14268
 
   query-engine:
-    image: ghcr.io/yaytay/query-engine-design-mode:0.0.40-main
+    image: ghcr.io/yaytay/query-engine-design-mode:0.0.41-main
     ports:
     - 2000:8080
     volumes:

query-engine/src/main/java/uk/co/spudsoft/query/defn/ProcessorMapLabel.java

@@ -43,9 +43,6 @@ public void validate() throws IllegalArgumentException {
     if (Strings.isNullOrEmpty(sourceLabel)) {
       throw new IllegalArgumentException("No source field name provided for relabel");
     }
-    if (newLabel == null) {
-      throw new IllegalArgumentException("No new field name provided for relabel - the new field name may be an empty string but cannot be null");
-    }
   }
 
   /**
@@ -67,11 +64,11 @@ public String getSourceLabel() {
   /**
    * The new name of the field, may be blank to remove a field.
    * <p>
-   * This value may not be null, but may be blank.
+   * This value may be null or blank, both of which will remove the field from the stream.
    * @return the new name of the field, may be blank to remove a field.
    */
   @Schema(description = """
-                        The new name of the field, may be blank to remove a field.
+                        The new name of the field, may be null or blank, both of which will remove the field from the stream.
                         """
           , maxLength = 100
           , requiredMode = Schema.RequiredMode.REQUIRED

query-engine/src/main/java/uk/co/spudsoft/query/main/Version.java

@@ -34,7 +34,7 @@ public final class Version {
   /**
    * The project version, as set in the Maven pom.xml.
    */
-  public static final String MAVEN_PROJECT_VERSION = "0.0.40-main";
+  public static final String MAVEN_PROJECT_VERSION = "0.0.41-main";
 
   private Version() {
   }

query-engine/src/test/java/uk/co/spudsoft/query/defn/ProcessorMapTest.java

@@ -62,9 +62,7 @@ public void testValidate() {
     assertThrows(IllegalArgumentException.class, () -> {
       ProcessorMap.builder().relabels(Arrays.asList(ProcessorMapLabel.builder().build())).build().validate();
     }, "Zero relabels provided");
-    assertThrows(IllegalArgumentException.class, () -> {
-      ProcessorMap.builder().relabels(Arrays.asList(ProcessorMapLabel.builder().sourceLabel("source").build())).build().validate();
-    }, "Zero relabels provided");
+    ProcessorMap.builder().relabels(Arrays.asList(ProcessorMapLabel.builder().sourceLabel("source").build())).build().validate();
     ProcessorMap.builder().relabels(Arrays.asList(ProcessorMapLabel.builder().sourceLabel("source").newLabel("new").build())).build().validate();
   }