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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-4371
    TableMacro and TableFunction should have List<? extends Objects> rather than List<Object> parameters
  3. Sub-task CALCITE-4327
    RelBuilder#scan(...) should work when used in RelRule#onMatch as call.builder()
  4. Sub-task CALCITE-4326
    NullPointerException possible in EnumerableWindow when agg.call.name is null
  5. Sub-task CALCITE-4320
    JdbcRules JOIN_FACTORY, AGGREGATE_FACTORY, SET_OP_FACTORY, ... create relations with wrong convention
  6. Sub-task CALCITE-4319
    NPE in TopDownRuleDriver#convert when convention is not enabled
  7. Sub-task CALCITE-4316
    Avoid NPE in getMonotonicity when nulls are used in divide call
  8. Sub-task CALCITE-4311
    Add non-nullable experimental accessors side by side with their nullable counterparts
  9. Sub-task CALCITE-4309
    Clarify org.apache.calcite.sql.type.SqlTypeName#getFamily nullability
  10. Sub-task CALCITE-4308
    JoinNode in Interpreter might fail with NPE for FULL join
  11. Sub-task CALCITE-4306
    ViewTableMacro#schemaPath is always initialized to non-null value, however, it is treated like nullable
  12. Sub-task CALCITE-4304
    Make org.apache.calcite.jdbc.JavaTypeFactoryImpl#getJavaClass non-nullable
  13. Sub-task CALCITE-4303
    Refactor org.apache.calcite.rel.RelInput to provide null-safe getters
  14. Sub-task CALCITE-4286
    Remove NonNull annotations
  15. Sub-task CALCITE-4285
    Replace jsr305 dependency with checkerframework and errorprone_annotations
  16. Sub-task CALCITE-4268
    org.apache.calcite.model.ModelHandler#checkRequiredAttributes should use Objects.requireNonNull
  17. Sub-task CALCITE-4263
    Clarify RelNode#estimateRowCount behavior with regards to nulls
  18. Sub-task CALCITE-4253
    RelOptUtil#findAllTables should probably use RelMetadataQuery#getTableReferences
  19. Sub-task CALCITE-4236
    Clarify if nulls are permissible to return from .SqlOperator#inferReturnType
  20. Sub-task CALCITE-4235
    SqlValidatorImpl#validateGroupItem and validateGroupingSets are not using AggregatingSelectScope parameter
  21. Sub-task CALCITE-4234
    RelBuilder throws NullPointerException while implementing GROUP_ID()
  22. Sub-task CALCITE-4231
    org.apache.calcite.rex.RexProgram.Marshaller might need overriding visitSubQuery / visitTableInputRef / visitPatternFieldRef
  23. Sub-task CALCITE-4229
    Add Util.throwAsRuntime and Util.causeOrSelf to simplify exception re-throwing
  24. Sub-task CALCITE-4228
    FlatLists.Flat6List#append should not throw NPE if there are null elements in the list
  25. Sub-task CALCITE-4227
    ImmutableIntList#toArray(Integer[]) should support arguments larger than the collection itself
  26. Sub-task CALCITE-4226
    Add Mappings#asListNonNull as a null-safe alternative for Mappings#asList
  27. Sub-task CALCITE-4222
    Clarify if null elements are allowed in RelTraitSet
  28. Sub-task CALCITE-4219
    Clarify SqlCall#getOperandList() nullability
  29. Sub-task CALCITE-4218
    Clarify RelMetadataQuery#getDistribution nullability
  30. Sub-task CALCITE-4217
    Unlock RelCrossType#getFieldCount()
  31. Sub-task CALCITE-4216
    Make org.apache.calcite.rel.type.RelDataType#getFamily non-nullable
  32. Sub-task CALCITE-4215
    Ensure org.apache.calcite.schema.Statistic uses null vs emptyList appropriately
  33. Sub-task CALCITE-4214
    Make RelDataType.getSqlTypeName non-nullable
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