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  1. Sub-task CALCITE-4372
    Correct specification getCumulativeCost and getNonCumulativeCost so it should always produce non-nullable value
  2. Sub-task CALCITE-4327
    RelBuilder#scan(...) should work when used in RelRule#onMatch as call.builder()
  3. Sub-task CALCITE-4326
    NullPointerException possible in EnumerableWindow when agg.call.name is null
  4. Sub-task CALCITE-4319
    NPE in TopDownRuleDriver#convert when convention is not enabled
  5. Sub-task CALCITE-4311
    Add non-nullable experimental accessors side by side with their nullable counterparts
  6. Sub-task CALCITE-4309
    Clarify org.apache.calcite.sql.type.SqlTypeName#getFamily nullability
  7. Sub-task CALCITE-4308
    JoinNode in Interpreter might fail with NPE for FULL join
  8. Sub-task CALCITE-4306
    ViewTableMacro#schemaPath is always initialized to non-null value, however, it is treated like nullable
  9. Sub-task CALCITE-4303
    Refactor org.apache.calcite.rel.RelInput to provide null-safe getters
  10. Sub-task CALCITE-4268
    org.apache.calcite.model.ModelHandler#checkRequiredAttributes should use Objects.requireNonNull
  11. Sub-task CALCITE-4263
    Clarify RelNode#estimateRowCount behavior with regards to nulls
  12. Sub-task CALCITE-4253
    RelOptUtil#findAllTables should probably use RelMetadataQuery#getTableReferences
  13. Sub-task CALCITE-4236
    Clarify if nulls are permissible to return from .SqlOperator#inferReturnType
  14. Sub-task CALCITE-4235
    SqlValidatorImpl#validateGroupItem and validateGroupingSets are not using AggregatingSelectScope parameter
  15. Sub-task CALCITE-4234
    RelBuilder throws NullPointerException while implementing GROUP_ID()
  16. Sub-task CALCITE-4231
    org.apache.calcite.rex.RexProgram.Marshaller might need overriding visitSubQuery / visitTableInputRef / visitPatternFieldRef
  17. Sub-task CALCITE-4222
    Clarify if null elements are allowed in RelTraitSet
  18. Sub-task CALCITE-4219
    Clarify SqlCall#getOperandList() nullability
  19. Sub-task CALCITE-4218
    Clarify RelMetadataQuery#getDistribution nullability
  20. Sub-task CALCITE-4215
    Ensure org.apache.calcite.schema.Statistic uses null vs emptyList appropriately
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