xzh_dz created CALCITE-4804:
-------------------------------
Summary: Support Snapshot operator serialization and
deserizalization
Key: CALCITE-4804
URL: https://issues.apache.org/jira/browse/CALCITE-4804
Project: Calcite
Issue Type: Improvement
Reporter: xzh_dz
In my project, the dimension table has versions of the contents of the table.
When I serialize the `Snapshot operator`, there are exceptions. Examples of
exceptions can be reproduced as follows.
{code:java}
// code placeholder
@Test void testSnapshot() {
// Equivalent SQL:
// SELECT *
// FROM products_temporal FOR SYSTEM_TIME AS OF TIMESTAMP '2011-07-20
12:34:56'
final RelBuilder builder = RelBuilder.create(config().build());
RelNode root =
builder.scan("products_temporal")
.snapshot(
builder.getRexBuilder().makeTimestampLiteral(
new TimestampString("2011-07-20 12:34:56"), 0))
.build();
RelJsonWriter jsonWriter = new RelJsonWriter();
root.explain(jsonWriter);
String relJson = jsonWriter.asString();
String s = deserializeAndDumpToTextFormat(getSchema(root), relJson);
}{code}
Exception:
{code:java}
// code placeholder
java.lang.RuntimeException: class does not have required constructor, class
org.apache.calcite.rel.logical.LogicalSnapshot(RelInput)java.lang.RuntimeException:
class does not have required constructor, class
org.apache.calcite.rel.logical.LogicalSnapshot(RelInput)java.lang.RuntimeException:
java.lang.RuntimeException: class does not have required constructor, class
org.apache.calcite.rel.logical.LogicalSnapshot(RelInput) at
org.apache.calcite.tools.Frameworks.withPrepare(Frameworks.java:193) at
org.apache.calcite.tools.Frameworks.withPlanner(Frameworks.java:135) at
org.apache.calcite.tools.Frameworks.withPlanner(Frameworks.java:153) at
org.apache.calcite.test.RelBuilderTest.deserializeAndDump(RelBuilderTest.java:4005)
at
org.apache.calcite.test.RelBuilderTest.deserializeAndDumpToTextFormat(RelBuilderTest.java:3981)
{code}
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