diff --git a/marble-table/src/test/java/org/apache/calcite/table/TypeConvertUtilTest.java b/marble-table/src/test/java/org/apache/calcite/table/TypeConvertUtilTest.java
new file mode 100644
index 0000000..b3f5f2f
--- /dev/null
+++ b/marble-table/src/test/java/org/apache/calcite/table/TypeConvertUtilTest.java
@@ -0,0 +1,176 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to you under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.calcite.table;
+
+import org.apache.calcite.util.NlsString;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.math.BigDecimal;
+import java.sql.Date;
+import java.sql.Timestamp;
+import java.util.ArrayList;
+import java.util.List;
+
+public class TypeConvertUtilTest {
+
+  @Test
+  public void testCastBigDecimal() {
+    final BigDecimal actual =
+            TypeConvertUtil.castBigDecimal(new BigDecimal(5));
+    Assert.assertEquals(new BigDecimal(5), actual);
+  }
+
+  @Test
+  public void testCastBoolean() {
+    Assert.assertFalse(TypeConvertUtil.castBoolean(false));
+  }
+
+  @Test
+  public void testCastDouble() {
+    Assert.assertEquals(3.0, TypeConvertUtil.castDouble(3.0), 0.0);
+  }
+
+  @Test
+  public void testCastFloat() {
+    Assert.assertEquals(4.0f, TypeConvertUtil.castFloat(4.0f), 0.0);
+  }
+
+  @Test
+  public void testCastInt() {
+    Assert.assertEquals(new Integer(0), TypeConvertUtil.castInt(0));
+  }
+
+  @Test
+  public void testCastList() {
+    final List<Integer> value = new ArrayList<>();
+    value.add(6);
+    final List<Integer> actual = TypeConvertUtil.castList(value);
+
+    final List<Integer> arrayList = new ArrayList<>();
+    arrayList.add(6);
+
+    Assert.assertEquals(arrayList, actual);
+  }
+
+  @Test
+  public void testCastLong() {
+    Assert.assertEquals(new Long(0L), TypeConvertUtil.castLong(0L));
+  }
+
+  @Test
+  public void testCastObject() {
+    Assert.assertEquals(0, TypeConvertUtil.castObject(0));
+  }
+
+  @Test
+  public void testCastString() {
+    Assert.assertEquals("Bar", TypeConvertUtil.castString("Bar"));
+  }
+
+  @Test
+  public void testToBigDecimal() {
+    Assert.assertNull(TypeConvertUtil.toBigDecimal(null));
+
+    Assert.assertEquals(new BigDecimal(8), TypeConvertUtil.toBigDecimal(8));
+  }
+
+  @Test
+  public void testToBoolean() {
+    Assert.assertNull(TypeConvertUtil.toBoolean(null));
+
+    Assert.assertTrue(TypeConvertUtil.toBoolean(9));
+  }
+
+  @Test
+  public void testToDate() {
+    Assert.assertNull(TypeConvertUtil.toDate(null, null));
+
+    Assert.assertEquals("1970-01-25",
+            TypeConvertUtil.toDate(2147483647, null).toString());
+    Assert.assertEquals("2019-06-11",
+            TypeConvertUtil.toDate(1560265977787L, null).toString());
+    Assert.assertEquals("2019-06-11",
+            TypeConvertUtil.toDate(new Date(1560265977787L), null).toString());
+  }
+
+  @Test
+  public void testToDouble() {
+    Assert.assertNull(TypeConvertUtil.toDouble(null));
+
+    Assert.assertEquals(10.0, TypeConvertUtil.toDouble(10.0), 0.0);
+  }
+
+  @Test
+  public void testToFloat() {
+    Assert.assertNull(TypeConvertUtil.toFloat(null));
+
+    Assert.assertEquals(11.0f, TypeConvertUtil.toFloat(11.0f), 0.0f);
+  }
+
+  @Test
+  public void testToInteger() {
+    Assert.assertNull(TypeConvertUtil.toInteger(null));
+
+    Assert.assertEquals(new Integer(0), TypeConvertUtil.toInteger(false));
+    Assert.assertEquals(new Integer(1), TypeConvertUtil.toInteger(true));
+    Assert.assertEquals(new Integer(12), TypeConvertUtil.toInteger(12));
+  }
+
+  @Test
+  public void testToLong() {
+    Assert.assertNull(TypeConvertUtil.toLong(null));
+
+    Assert.assertEquals(new Long(13L), TypeConvertUtil.toLong(13));
+  }
+
+  @Test
+  public void testToShort() {
+    Assert.assertNull(TypeConvertUtil.toShort(null));
+
+    Assert.assertEquals(new Short((short)14), TypeConvertUtil.toShort(14));
+  }
+
+  @Test
+  public void testToString() {
+    Assert.assertNull(TypeConvertUtil.toString(null));
+
+    final NlsString nlsString = new NlsString("abc", null, null);
+    Assert.assertEquals("abc", TypeConvertUtil.toString(nlsString));
+    Assert.assertEquals("15", TypeConvertUtil.toString("15"));
+  }
+
+  @Test
+  public void testToTimestamp() {
+    Assert.assertNull(TypeConvertUtil.toTimestamp(null, null));
+
+    Assert.assertEquals("2019-06-11 16:12:57.787",
+            TypeConvertUtil.toTimestamp(1560265977787L,
+                    null).toString());
+    Assert.assertEquals("1970-01-25 21:31:23.647",
+            TypeConvertUtil.toTimestamp(2147483647,
+                    null).toString());
+    Assert.assertEquals("2019-06-11 16:12:57.787",
+            TypeConvertUtil.toTimestamp(new Timestamp(1560265977787L),
+                    null).toString());
+    Assert.assertEquals("2019-06-11 16:12:57.787",
+            TypeConvertUtil.toTimestamp(new Date(1560265977787L),
+                    null).toString());
+  }
+
+}