[jira] [Created] (CALCITE-3583) Support serialized to json and deserialized from json for Exchange relation operator

[Wang Yanlin (Jira)]

Wang Yanlin created CALCITE-3583:
------------------------------------

             Summary: Support serialized to json and deserialized from json for 
Exchange relation operator
                 Key: CALCITE-3583
                 URL: https://issues.apache.org/jira/browse/CALCITE-3583
             Project: Calcite
          Issue Type: Improvement
            Reporter: Wang Yanlin


Currently, serialize Exchange relnode to json  will cause exception

{code:java}
// RelWriterTest
@Test public void testExchange() {
    final FrameworkConfig config = RelBuilderTest.config().build();
    final RelBuilder builder = RelBuilder.create(config);
    final RelNode rel = builder
        .scan("EMP")
        .exchange(RelDistributions.hash(ImmutableList.of(0, 1)))
        .build();
    String relJson = RelOptUtil.dumpPlan("", rel,
        SqlExplainFormat.JSON, SqlExplainLevel.EXPPLAN_ATTRIBUTES);
    String s = deserializeAndDumpToTextFormat(getSchema(rel), relJson);
    final String expected = ""
        + "LogicalExchange(distribution=[hash[0, 1]])\n"
        + "  LogicalTableScan(table=[[scott, EMP]])\n";
    assertThat(s, isLinux(expected));
  }
{code}

got


{code:java}
java.lang.UnsupportedOperationException: type not serializable: hash[0, 1] 
(type org.apache.calcite.rel.RelDistributions.RelDistributionImpl)

        at org.apache.calcite.rel.externalize.RelJson.toJson(RelJson.java:290)
        at 
org.apache.calcite.rel.externalize.RelJsonWriter.put(RelJsonWriter.java:83)
        at 
org.apache.calcite.rel.externalize.RelJsonWriter.explain_(RelJsonWriter.java:66)
        at 
org.apache.calcite.rel.externalize.RelJsonWriter.done(RelJsonWriter.java:128)
        at 
org.apache.calcite.rel.AbstractRelNode.explain(AbstractRelNode.java:299)
        at org.apache.calcite.plan.RelOptUtil.dumpPlan(RelOptUtil.java:1981)
        at 
org.apache.calcite.plan.RelWriterTest.testExchange(RelWriterTest.java:772)
{code}





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