[hansva]

…ry row, fixes #9349

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[bamaer]

Thanks @hansva, looks good.

Built the avro plugin and ran its tests: all pass. buildsTheValueMetadataOncePerFieldAndType fails against the current AvroDecode and passes with this change. I also compared output before and after on 15 target conversions (String/Integer/Number/BigNumber/Date with number and date formats), with field types changing between records: identical results.

LGTM.