throw invalid argument when empty vector search constructed (#170)

Couchbase/VectorQuery.php

@@ -33,7 +33,7 @@ class VectorQuery
     /**
      * @param string $vectorFieldName the document field that contains the vector
      * @param array<float>|string $vectorQuery the vector query to run. Cannot be empty. Either a vector array,
-     * or the vector query encoded into a base64 string.
+     * or a base64-encoded sequence of little-endian IEEE 754 floats.
      *
      * @since 4.1.7
      *

Couchbase/VectorSearch.php

@@ -20,6 +20,7 @@
 
 namespace Couchbase;
 
+use Couchbase\Exception\InvalidArgumentException;
 use JsonSerializable;
 
 class VectorSearch implements JsonSerializable
@@ -31,12 +32,17 @@ class VectorSearch implements JsonSerializable
      * @param array<VectorQuery> $vectorQueries The vector queries to be run.
      * @param VectorSearchOptions|null $options The options to use on the vector queries
      *
+     * @throws InvalidArgumentException
+     *
      * @since 4.1.7
      *
      * @UNCOMMITTED: This API may change in the future.
      */
     public function __construct(array $vectorQueries, VectorSearchOptions $options = null)
     {
+        if (empty($vectorQueries)) {
+            throw new InvalidArgumentException("At least one vector query must be specified");
+        }
         $this->vectorQueries = $vectorQueries;
         $this->options = $options;
     }