Merge pull request #53 from trocco-io/change-json-obejct-to-variant

json default VARIANT not OBJECT

Author: giwa

src/main/java/org/embulk/output/SnowflakeOutputPlugin.java

@@ -207,7 +207,7 @@ public void jsonColumn(Column column) {
                   JdbcColumn.newGenericTypeColumn(
                       columnName,
                       Types.OTHER,
-                      "OBJECT",
+                      "VARIANT",
                       4000,
                       0,
                       false,