diff --git a/jdbc-adapter/virtualschema-jdbc-adapter/src/main/java/com/exasol/adapter/dialects/redshift/RedshiftColumnMetadataReader.java b/jdbc-adapter/virtualschema-jdbc-adapter/src/main/java/com/exasol/adapter/dialects/redshift/RedshiftColumnMetadataReader.java
index f4ebfd7b2..d5caeedae 100644
--- a/jdbc-adapter/virtualschema-jdbc-adapter/src/main/java/com/exasol/adapter/dialects/redshift/RedshiftColumnMetadataReader.java
+++ b/jdbc-adapter/virtualschema-jdbc-adapter/src/main/java/com/exasol/adapter/dialects/redshift/RedshiftColumnMetadataReader.java
@@ -47,7 +47,7 @@ protected DataType mapJdbcTypeOther(final JdbcTypeDescription jdbcTypeDescriptio
         } else {
             LOGGER.finer(() -> "Mapping JDBC type OTHER [" + jdbcTypeDescription.getTypeName()
                     + "] to maximum size VARCHAR.");
+            return DataType.createMaximumSizeVarChar(DataType.ExaCharset.UTF8);
         }
-        return DataType.createMaximumSizeVarChar(DataType.ExaCharset.UTF8);
     }
 }
\ No newline at end of file
diff --git a/jdbc-adapter/virtualschema-jdbc-adapter/src/test/java/com/exasol/adapter/dialects/redshift/RedshiftColumnMetadataReaderTest.java b/jdbc-adapter/virtualschema-jdbc-adapter/src/test/java/com/exasol/adapter/dialects/redshift/RedshiftColumnMetadataReaderTest.java
index 435925dd1..60266b060 100644
--- a/jdbc-adapter/virtualschema-jdbc-adapter/src/test/java/com/exasol/adapter/dialects/redshift/RedshiftColumnMetadataReaderTest.java
+++ b/jdbc-adapter/virtualschema-jdbc-adapter/src/test/java/com/exasol/adapter/dialects/redshift/RedshiftColumnMetadataReaderTest.java
@@ -11,6 +11,7 @@
 import com.exasol.adapter.AdapterProperties;
 import com.exasol.adapter.dialects.*;
 import com.exasol.adapter.metadata.DataType;
+import com.exasol.adapter.metadata.DataType.ExaCharset;
 
 class RedshiftColumnMetadataReaderTest extends AbstractColumnMetadataReaderTest {
     @BeforeEach
@@ -40,4 +41,10 @@ void testMapJdbcTypeOtherDouble() {
         assertThat(this.columnMetadataReader.mapJdbcType(new JdbcTypeDescription(Types.OTHER, 0, 0, 0, "double")),
                 equalTo(DataType.createDouble()));
     }
+
+    @Test
+    void testMapJdbcTypeOtherUnknownToMaxVarChar() {
+        assertThat(this.columnMetadataReader.mapJdbcType(new JdbcTypeDescription(Types.OTHER, 0, 0, 0, "unknown")),
+                equalTo(DataType.createMaximumSizeVarChar(ExaCharset.UTF8)));
+    }
 }
\ No newline at end of file
diff --git a/jdbc-adapter/virtualschema-jdbc-adapter/src/test/java/com/exasol/adapter/dialects/redshift/RedshiftSqlDialectTest.java b/jdbc-adapter/virtualschema-jdbc-adapter/src/test/java/com/exasol/adapter/dialects/redshift/RedshiftSqlDialectTest.java
index acf029b63..735310e9c 100644
--- a/jdbc-adapter/virtualschema-jdbc-adapter/src/test/java/com/exasol/adapter/dialects/redshift/RedshiftSqlDialectTest.java
+++ b/jdbc-adapter/virtualschema-jdbc-adapter/src/test/java/com/exasol/adapter/dialects/redshift/RedshiftSqlDialectTest.java
@@ -9,7 +9,7 @@
 import static com.exasol.adapter.capabilities.ScalarFunctionCapability.*;
 import static com.exasol.reflect.ReflectionUtils.getMethodReturnViaReflection;
 import static org.hamcrest.CoreMatchers.containsString;
-import static org.hamcrest.Matchers.instanceOf;
+import static org.hamcrest.Matchers.*;
 import static org.hamcrest.collection.IsIterableContainingInAnyOrder.containsInAnyOrder;
 import static org.junit.Assert.assertThat;
 import static org.junit.jupiter.api.Assertions.assertAll;
@@ -19,7 +19,6 @@
 import java.util.HashMap;
 import java.util.Map;
 
-import org.hamcrest.MatcherAssert;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
@@ -30,6 +29,8 @@
 import com.exasol.adapter.capabilities.Capabilities;
 import com.exasol.adapter.dialects.PropertyValidationException;
 import com.exasol.adapter.dialects.SqlDialect;
+import com.exasol.adapter.dialects.SqlDialect.NullSorting;
+import com.exasol.adapter.sql.ScalarFunction;
 
 @ExtendWith(MockitoExtension.class)
 class RedshiftSqlDialectTest {
@@ -97,7 +98,7 @@ void testValidateDialectNameProperty() {
         final SqlDialect sqlDialect = new RedshiftSqlDialect(null, adapterProperties);
         final PropertyValidationException exception = assertThrows(PropertyValidationException.class,
                 sqlDialect::validateProperties);
-        MatcherAssert.assertThat(exception.getMessage(), containsString(
+        assertThat(exception.getMessage(), containsString(
                 "The dialect REDSHIFT cannot have the name ORACLE. You specified the wrong dialect name or created the wrong dialect class."));
     }
 
@@ -114,4 +115,40 @@ private void setMandatoryProperties(final String sqlDialectProperty) {
         this.rawProperties.put(AdapterProperties.SQL_DIALECT_PROPERTY, sqlDialectProperty);
         this.rawProperties.put(AdapterProperties.CONNECTION_NAME_PROPERTY, "MY_CONN");
     }
+
+    @Test
+    void testGetScalarFunctionAliases() {
+        final Map<ScalarFunction, String> scalarFunctionAliases = this.dialect.getScalarFunctionAliases();
+        assertThat(scalarFunctionAliases, aMapWithSize(5));
+    }
+
+    @Test
+    void testGetAggregateFunctionAliases() {
+        assertThat(this.dialect.getAggregateFunctionAliases(), aMapWithSize(0));
+    }
+
+    @Test
+    void testApplyQuote() {
+        assertThat(this.dialect.applyQuote("Foo\"Bar"), equalTo("\"Foo\"\"Bar\""));
+    }
+
+    @Test
+    void testRequiresCatalogQualifiedTableNames() {
+        assertThat(this.dialect.requiresCatalogQualifiedTableNames(null), equalTo(false));
+    }
+
+    @Test
+    void testRequiresSchemaQualifiedTableNames() {
+        assertThat(this.dialect.requiresSchemaQualifiedTableNames(null), equalTo(true));
+    }
+
+    @Test
+    void testGetDefaultNullSorting() {
+        assertThat(this.dialect.getDefaultNullSorting(), equalTo(NullSorting.NULLS_SORTED_AT_END));
+    }
+
+    @Test
+    void testGetStringLiteral() {
+        assertThat(this.dialect.getStringLiteral("Foo'Bar"), equalTo("'Foo''Bar'"));
+    }
 }
\ No newline at end of file