Re-added fromString

Author: cgivre

exec/java-exec/src/main/java/org/apache/drill/exec/store/easy/json/loader/JsonLoaderImpl.java

@@ -194,6 +194,11 @@ public JsonLoaderBuilder fromStream(int start, int end, DrillBuf buf) {
       return this;
     }
 
+    public JsonLoaderBuilder fromString(String jsonString) {
+      this.streams = Collections.singletonList(IOUtils.toInputStream(jsonString, Charset.defaultCharset()));
+      return this;
+    }
+
     public JsonLoaderBuilder fromStream(Iterable<InputStream> streams) {
       this.streams = streams;
       return this;