#900 - Error - Can't fetch JsonDB field - org.postgresql.util.PSQLException: ERROR: could not identify an equality operator for type json

src/test/java/io/ebeaninternal/server/query/SqlTreeBuilderTest.java

@@ -0,0 +1,63 @@
+package io.ebeaninternal.server.query;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class SqlTreeBuilderTest {
+
+  @Test
+  public void mergeOnDistinct_equal() throws Exception {
+
+    assertEquals(SqlTreeBuilder.mergeOnDistinct("t0.id", "t0.id"), "t0.id");
+  }
+
+  @Test
+  public void mergeOnDistinct_add() throws Exception {
+
+    assertEquals(SqlTreeBuilder.mergeOnDistinct("t0.id", "t0.cre"), "t0.cre, t0.id");
+  }
+
+  @Test
+  public void mergeOnDistinct_contained() throws Exception {
+
+    assertEquals(SqlTreeBuilder.mergeOnDistinct("t0.id", "t0.cre, t0.id"), "t0.cre, t0.id");
+  }
+
+  @Test
+  public void mergeOnDistinct_overlap() throws Exception {
+
+    assertEquals(SqlTreeBuilder.mergeOnDistinct("t0.id, t1.id", "t0.cre, t0.id"), "t0.cre, t0.id, t1.id");
+  }
+
+  @Test
+  public void mergeOnDistinct_overlapBoth() throws Exception {
+
+    assertEquals(SqlTreeBuilder.mergeOnDistinct("t0.id, t1.id", "t0.cre, t1.id, t0.id"), "t0.cre, t1.id, t0.id");
+  }
+
+  @Test
+  public void mergeOnDistinct_inlineAscDesc() throws Exception {
+
+    assertEquals(SqlTreeBuilder.mergeOnDistinct("t0.id", "t0.cre asc, t1.bb desc, t3.b"), "t0.cre, t1.bb, t3.b, t0.id");
+  }
+
+  @Test
+  public void mergeOnDistinct_inlineAscDesc2() throws Exception {
+
+    assertEquals(SqlTreeBuilder.mergeOnDistinct("t0.id", "t0.cre desc, t1.bb asc, t3.b"), "t0.cre, t1.bb, t3.b, t0.id");
+  }
+
+  @Test
+  public void mergeOnDistinct_trailingAsc() throws Exception {
+
+    assertEquals(SqlTreeBuilder.mergeOnDistinct("t0.id", "t0.cre asc"), "t0.cre, t0.id");
+  }
+
+  @Test
+  public void mergeOnDistinct_trailingDesc() throws Exception {
+
+    assertEquals(SqlTreeBuilder.mergeOnDistinct("t0.id", "t0.cre desc"), "t0.cre, t0.id");
+  }
+
+}