[jira] [Created] (CALCITE-3875) Create visitor to emit java code that would reproduce the visited rel

["Justin Swett (Jira)" <ji...@apache.org>]

Justin Swett created CALCITE-3875:
-------------------------------------

             Summary: Create visitor to emit java code that would reproduce the visited rel
                 Key: CALCITE-3875
                 URL: https://issues.apache.org/jira/browse/CALCITE-3875
             Project: Calcite
          Issue Type: New Feature
    Affects Versions: 1.22.0
            Reporter: Justin Swett


It would be nice to have a visitor that would emit java code that could be used to reproduce the visited rel node, e.g.

Something like:
{code:java}
    ...
    String javaCode = RelOptUtil.toCode( myComplicatedRel );
    println(javaCode);

    // outputs something
    final RelBuilder builder = relBuilder();
    final RelNode root = builder
        .scan("EMP")
        .aggregate(builder.groupKey(),
            builder.aggregateCall(SqlStdOperatorTable.SUM0, false, false, null,
                "s", builder.field(3)))
        .build();
{code}

This could be useful setting up reproducible test cases that are somewhat tricky to recreate in the wild.



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