oracle - Query returning -> ORA-19011: Character string buffer too small -

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i'm running query below, , oracle returning following message: query returning -> ora-19011: character string buffer small when uncomment last line, works. think thats why return few results. how solve this?

 select substr(xmlagg(xmlelement (e, str||',')).extract ('//text()'),1,(length(trim(xmlagg (xmlelement (e, str||',')).extract ('//text()')))-2)) motivos      (            select to_char(lo_valor) str              editor_layout el,                   editor_versao_documento ev,                   editor_documento ed,                   editor_layout_campo elc,                   editor_campo ec,                   editor_registro er,                   editor_registro_campo erc,                   pw_editor_clinico pec,                   pw_documento_clinico pdc             pec.cd_editor_registro   = er.cd_registro               , pdc.cd_documento_clinico = pec.cd_documento_clinico               , ed.cd_documento          = ev.cd_documento               , el.cd_versao_documento   = ev.cd_versao_documento               , el.cd_layout             = elc.cd_layout               , elc.cd_campo             = ec.cd_campo               , elc.cd_campo             = erc.cd_campo               , er.cd_registro           = erc.cd_registro               , er.cd_layout             = el.cd_layout               , ec.ds_identificador = 'nut_orientacoes_entregues_1'               , to_char(lo_valor) not null               --and trunc(pdc.dh_documento) between trunc(sysdate-5) , trunc(sysdate)           )

the contents of xmlagg(xmlelement ...) call returns clob, , trying stuff varchar2 since call substr example. fail if clob large.

the reason fail when uncomment last line outside range, there rows having contents long.


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