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isthmus: a UserTypeMapper's reverse direction only sees user-defined types, so a mapped built-in cannot come back

Status: Open.

#1219 In substrait-io/substrait-java;

· nielspardon opened on Aug 31, 2026

refactor(isthmus): visit(VirtualTableScan) builds one empty LogicalValues per row and two parallel value lists

Status: Open.

#1218 In substrait-io/substrait-java;

· nielspardon opened on Aug 31, 2026

refactor(isthmus): visit(Aggregate) duplicates applyRelCommon's composition, so further RelCommon handling would miss it

Status: Open.

#1217 In substrait-io/substrait-java;

· nielspardon opened on Aug 31, 2026

isthmus: the extension-converter example never calls applyRelCommon, so a custom relation's emit mapping and hint names are dropped

Status: Open.

#1216 In substrait-io/substrait-java;

· nielspardon opened on Aug 31, 2026

isthmus: nothing fails when a relation's conversion forgets applyRelCommon, so its emit mapping is dropped again

Status: Open.

#1215 In substrait-io/substrait-java;

· nielspardon opened on Aug 31, 2026

isthmus: a hint's output names are dropped whenever a column is a struct, because nested field names are compared

Status: Open.

#1214 In substrait-io/substrait-java;

· nielspardon opened on Aug 31, 2026

isthmus: visit(NamedWrite) ignores output_mode, so a write declaring MODIFIED_RECORDS converts to a ROWCOUNT TableModify

Status: Open.

#1213 In substrait-io/substrait-java;

· nielspardon opened on Aug 31, 2026

core: Rel.Remap validates none of its indices, so a malformed emit mapping fails as a bare index exception deep in a consumer

Status: Open.

#1212 In substrait-io/substrait-java;

· nielspardon opened on Aug 31, 2026

isthmus: visit(Aggregate) reads the grouping sets but not the group set, so a Calcite aggregate with a key in no grouping set loses a column

Status: Open.

#1211 In substrait-io/substrait-java;

· nielspardon opened on Aug 31, 2026

core: the grouping-column rule of an aggregate is derived in six places over two equality relations, so the derivations can disagree

Status: Open.

#1210 In substrait-io/substrait-java;

· nielspardon opened on Aug 31, 2026

isthmus: the order of an aggregate's grouping sets is not preserved, so the grouping-set index column reports a different set after a round trip

Status: Open.

#1209 In substrait-io/substrait-java;

· nielspardon opened on Aug 31, 2026

refactor(isthmus): DynamicConverterProvider appends a duplicate ScalarFunctionConverter that never fires

Status: Open.

#1208 In substrait-io/substrait-java;

· nielspardon opened on Aug 31, 2026