fix(arrow/array): preserve rows for empty-schema JSON input - #1117
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Rationale for this change
JSONReader currently derives the row count from field builder lengths. With an empty schema there are no field builders, so valid JSON objects are reported as zero-row batches.
What changes are included in this PR?
Track decoded rows independently so single-record and whole-input reads preserve rows even when the schema has no fields.
Are these changes tested?
go test ./arrow/arrayAre there any user-facing changes?
No API changes. This corrects the reported behavior while preserving the existing ownership and compatibility contracts.