#1653 - ENH: Add support for ClickHouse database

With array type conversion etc

src/test/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/BaseTableDdlTest.java

@@ -2,6 +2,7 @@ package io.ebeaninternal.dbmigration.ddlgeneration.platform;
 
 
 import io.ebean.config.ServerConfig;
+import io.ebean.config.dbplatform.clickhouse.ClickHousePlatform;
 import io.ebean.config.dbplatform.h2.H2Platform;
 import io.ebean.config.dbplatform.mysql.MySqlPlatform;
 import io.ebean.config.dbplatform.oracle.OraclePlatform;
@@ -62,6 +63,23 @@ public class BaseTableDdlTest {
     assertThat(ddl).contains("alter table mytable add column col_name varchar2(20)");
   }
 
+  @Test
+  public void testAddColumn_withTypeConversion_clickHouseVarchar() throws IOException {
+
+    ClickHouseTableDdl ddlGen = new ClickHouseTableDdl(serverConfig, PlatformDdlBuilder.create(new ClickHousePlatform()));
+
+    DdlWrite write = new DdlWrite();
+
+    Column column = new Column();
+    column.setName("col_name");
+    column.setType("varchar(20)");
+
+    ddlGen.alterTableAddColumn(write.apply(), "mytable", column, false, false);
+
+    String ddl = write.apply().getBuffer();
+    assertThat(ddl).contains("alter table mytable add column col_name String");
+  }
+
   @Test
   public void testAlterColumnComment() throws IOException {
 

src/test/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/ClickHouseDbArrayTest.java

@@ -0,0 +1,24 @@
+package io.ebeaninternal.dbmigration.ddlgeneration.platform;
+
+import org.junit.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class ClickHouseDbArrayTest {
+
+  @Test
+  public void logicalToNative() {
+
+    assertThat(ClickHouseDbArray.logicalToNative("uuid[]")).isEqualTo("Array(UUID)");
+    assertThat(ClickHouseDbArray.logicalToNative("varchar[]")).isEqualTo("Array(String)");
+    assertThat(ClickHouseDbArray.logicalToNative("integer[]")).isEqualTo("Array(UInt32)");
+    assertThat(ClickHouseDbArray.logicalToNative("bigint[]")).isEqualTo("Array(UInt64)");
+  }
+
+  @Test
+  public void logicalToNative_withFallbackDefined() {
+
+    assertThat(ClickHouseDbArray.logicalToNative("uuid[]:(1000)")).isEqualTo("Array(UUID)");
+  }
+
+}