string/binary conversion on write

nbactions.xml

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<actions>
+        <action>
+            <actionName>build</actionName>
+            <packagings>
+                <packaging>*</packaging>
+            </packagings>
+            <goals>
+                <goal>install</goal>
+            </goals>
+            <properties>
+                <skipTests>true</skipTests>
+            </properties>
+        </action>
+        <action>
+            <actionName>rebuild</actionName>
+            <packagings>
+                <packaging>*</packaging>
+            </packagings>
+            <goals>
+                <goal>clean</goal>
+                <goal>install</goal>
+            </goals>
+            <properties>
+                <skipTests>true</skipTests>
+            </properties>
+        </action>
+    </actions>

src/main/java/tech/ydb/spark/connector/YdbTypes.java

@@ -3,6 +3,7 @@
 import java.io.Serializable;
 import java.math.BigDecimal;
 import java.math.BigInteger;
+import java.nio.charset.StandardCharsets;
 import java.time.Instant;
 import java.time.LocalDate;
 import java.time.LocalDateTime;
@@ -662,6 +663,12 @@ private Value<?> convertBytesToYdb(Object v, YdbFieldType t) {
         if (v instanceof byte[]) {
             return PrimitiveValue.newBytes((byte[]) v);
         }
+        if (v instanceof String) {
+            return PrimitiveValue.newBytes(v.toString().getBytes(StandardCharsets.UTF_8));
+        }
+        if (v instanceof UTF8String) {
+            return PrimitiveValue.newBytes(((UTF8String) v).getBytes());
+        }
         throw badConversion(v, t);
     }