{"Entry":{"collection":"sqlstate","key":"HV021","name":"HV021","aliases":[],"metadata":{"aliases":[],"case_count":0,"class_code":"HV","condition_name":"fdw_inconsistent_descriptor_information","condition_names":["fdw_inconsistent_descriptor_information"],"content_hash":"d5da91e89c4e567d303cfdf17f26f3185ec1f04b45a30a03d37f1aec551e60d9","depth":"reference","editorial_review":"reviewed","evidence_tier":"definition_only","imported_at":"2026-09-30T17:45:28.119573+08:00","introduced":null,"known_present_by":"9.1.0","macros":["ERRCODE_FDW_INCONSISTENT_DESCRIPTOR_INFORMATION"],"name_zh":"","present_in":["9.1","9.2","9.3","9.4","9.5","9.6","10","11","12","13","14","15","16","17","18","19"],"preview_in":["19"],"primary_macro":"ERRCODE_FDW_INCONSISTENT_DESCRIPTOR_INFORMATION","removed":null,"runtime_verification":"not_run","severity_classes":["E"],"snippet_count":0,"source_rev":"english-manuals:71d6fe3361cc9940f26a1f6325d6c801096169d7cb9a524588b6fed347cb07f0","sqlstate":"HV021","status":"active","summary_zh":"包装器描述符中的信息互相不一致。"}},"Definition":{"Collection":"sqlstate","Key":"HV021","SourceDatabase":"center","Version":"18","SourceTable":"sqlstate","SourceKey":"HV021","SourceRevision":"english-manuals:71d6fe3361cc9940f26a1f6325d6c801096169d7cb9a524588b6fed347cb07f0","Facts":{"aliases":[],"class_name":"Foreign Data Wrapper Error (SQL/MED)","condition_name":"fdw_inconsistent_descriptor_information","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"56dacf78e618ff0fd8c533e05db597b80d7ebbad7f8e512a888217d0640aa328","slug":"18"},"lang":"en","sqlstate":"HV021"},"ManualEvidence":{"doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"56dacf78e618ff0fd8c533e05db597b80d7ebbad7f8e512a888217d0640aa328","slug":"18"}},"MeasuredEvidence":{}},"Text":{"Collection":"sqlstate","Key":"HV021","SourceDatabase":"center","Version":"","Locale":"en","Title":"HV021 — fdw_inconsistent_descriptor_information","Summary":"HV021 identifies inconsistent information in an FDW descriptor. The 18.6 core/contrib call scan has no resolved HV021 report group, so it does not identify a core descriptor check or message.","BodyHTML":"\u003ch1\u003eHV021 — fdw_inconsistent_descriptor_information\u003c/h1\u003e\n\u003ch2\u003eAt a glance {#at-a-glance}\u003c/h2\u003e\n\u003cp\u003e\u003ccode\u003eHV021\u003c/code\u003e identifies inconsistent information in an FDW descriptor. The 18.6 core/contrib call scan has no resolved \u003ccode\u003eHV021\u003c/code\u003e report group, so it does not identify a core descriptor check or message.\u003c/p\u003e\n\u003ch2\u003eMeaning {#meaning}\u003c/h2\u003e\n\u003cp\u003eThe descriptor may describe columns, types, names, lengths, or another wrapper-owned result contract. \u003ccode\u003efdwapi.h\u003c/code\u003e exposes callback and slot boundaries, but it does not say which descriptor mismatch maps to this SQLSTATE.\u003c/p\u003e\n\u003ch2\u003eMessages and diagnostics {#messages}\u003c/h2\u003e\n\u003cp\u003eNo resolved 18.6 core/contrib message variant was found. Preserve the full diagnostic, descriptor kind, expected and actual metadata when shown, callback phase, wrapper/driver version, and relation identity.\u003c/p\u003e\n\u003ch2\u003eDiagnosis {#diagnosis}\u003c/h2\u003e\n\u003cp\u003eCompare the descriptor supplied by the wrapper with the descriptor expected by the callback or consumer. Check schema changes, type and column order, nullability or length metadata only when the wrapper reports them; do not infer a mismatch from a generic conversion failure.\u003c/p\u003e\n\u003ch2\u003eResponse {#response}\u003c/h2\u003e\n\u003cp\u003eCorrect the wrapper\u0026#39;s descriptor construction or the remote/schema contract it actually identifies, then recreate the affected plan or object. Repeating the same operation without changing the mismatched metadata will not repair the descriptor.\u003c/p\u003e\n\u003ch2\u003eVersions {#versions}\u003c/h2\u003e\n\u003cp\u003e\u003ccode\u003eHV021\u003c/code\u003e is present in the locked definition snapshots from 9.1.24 through 18.6 and 19 Beta 3, with \u003ccode\u003eknown_present_by\u003c/code\u003e 9.1.0. The available pre-9 definition material does not establish an exact introduction release.\u003c/p\u003e\n\u003ch2\u003eRelated {#related}\u003c/h2\u003e\n\u003cp\u003e\u003ca href=\"/wiki/sqlstate/HV008/\" rel=\"nofollow\"\u003e\u003ccode\u003eHV008\u003c/code\u003e\u003c/a\u003e concerns an FDW column sequence; \u003ca href=\"/wiki/sqlstate/HV091/\" rel=\"nofollow\"\u003e\u003ccode\u003eHV091\u003c/code\u003e\u003c/a\u003e concerns a descriptor field identifier; \u003ca href=\"/wiki/sqlstate/HV024/\" rel=\"nofollow\"\u003e\u003ccode\u003eHV024\u003c/code\u003e\u003c/a\u003e concerns an attribute value.\u003c/p\u003e\n\u003ch2\u003eSources {#sources}\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/errcodes.txt#L463\" rel=\"nofollow\"\u003e\u003ccode\u003eerrcodes.txt\u003c/code\u003e\u003c/a\u003e — definition, SHA-256 \u003ccode\u003e6e8de346643ba84aa3c9c6a73360acfc7b2dfb89162c06c08ce9bf5bcd5bbcba\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/include/foreign/fdwapi.h#L24-L55\" rel=\"nofollow\"\u003e\u003ccode\u003efdwapi.h\u003c/code\u003e\u003c/a\u003e — generic FDW callback boundary.\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#sources\" rel=\"nofollow\"\u003eStructured evidence\u003c/a\u003e — fixed 18.6 sources and bounded scan.\u003c/li\u003e\n\u003c/ul\u003e\n","SourceRevision":"english-manuals:71d6fe3361cc9940f26a1f6325d6c801096169d7cb9a524588b6fed347cb07f0","ContentHash":"ce5d0d3ce23d9e7f1682607ac99c06a4331beaded082a0d130292e9114e5a295","Payload":{"body_md":"# HV021 — fdw_inconsistent_descriptor_information\n\n## At a glance {#at-a-glance}\n\n`HV021` identifies inconsistent information in an FDW descriptor. The 18.6 core/contrib call scan has no resolved `HV021` report group, so it does not identify a core descriptor check or message.\n\n\n## Meaning {#meaning}\n\nThe descriptor may describe columns, types, names, lengths, or another wrapper-owned result contract. `fdwapi.h` exposes callback and slot boundaries, but it does not say which descriptor mismatch maps to this SQLSTATE.\n\n## Messages and diagnostics {#messages}\n\nNo resolved 18.6 core/contrib message variant was found. Preserve the full diagnostic, descriptor kind, expected and actual metadata when shown, callback phase, wrapper/driver version, and relation identity.\n\n## Diagnosis {#diagnosis}\n\nCompare the descriptor supplied by the wrapper with the descriptor expected by the callback or consumer. Check schema changes, type and column order, nullability or length metadata only when the wrapper reports them; do not infer a mismatch from a generic conversion failure.\n\n## Response {#response}\n\nCorrect the wrapper's descriptor construction or the remote/schema contract it actually identifies, then recreate the affected plan or object. Repeating the same operation without changing the mismatched metadata will not repair the descriptor.\n\n## Versions {#versions}\n\n`HV021` is present in the locked definition snapshots from 9.1.24 through 18.6 and 19 Beta 3, with `known_present_by` 9.1.0. The available pre-9 definition material does not establish an exact introduction release.\n\n## Related {#related}\n\n[`HV008`](/wiki/sqlstate/HV008/) concerns an FDW column sequence; [`HV091`](/wiki/sqlstate/HV091/) concerns a descriptor field identifier; [`HV024`](/wiki/sqlstate/HV024/) concerns an attribute value.\n\n## Sources {#sources}\n\n- [`errcodes.txt`](https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/errcodes.txt#L463) — definition, SHA-256 `6e8de346643ba84aa3c9c6a73360acfc7b2dfb89162c06c08ce9bf5bcd5bbcba`.\n- [`fdwapi.h`](https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/include/foreign/fdwapi.h#L24-L55) — generic FDW callback boundary.\n- [Structured evidence](#sources) — fixed 18.6 sources and bounded scan.\n","description":"PostgreSQL SQLSTATE HV021 names an FDW descriptor-consistency condition; the descriptor and producer must be identified from the wrapper implementation.","is_stale":false,"name":"","sections":[{"anchor":"","heading":"","html":"\u0026lt;h1\u0026gt;HV021 — fdw_inconsistent_descriptor_information\u0026lt;/h1\u0026gt;"},{"anchor":"at-a-glance","heading":"At a glance","html":"\u003cp\u003e\u003ccode\u003eHV021\u003c/code\u003e identifies inconsistent information in an FDW descriptor. The 18.6 core/contrib call scan has no resolved \u003ccode\u003eHV021\u003c/code\u003e report group, so it does not identify a core descriptor check or message.\u003c/p\u003e"},{"anchor":"meaning","heading":"Meaning","html":"\u003cp\u003eThe descriptor may describe columns, types, names, lengths, or another wrapper-owned result contract. \u003ccode\u003efdwapi.h\u003c/code\u003e exposes callback and slot boundaries, but it does not say which descriptor mismatch maps to this SQLSTATE.\u003c/p\u003e"},{"anchor":"messages","heading":"Messages and diagnostics","html":"\u003cp\u003eNo resolved 18.6 core/contrib message variant was found. Preserve the full diagnostic, descriptor kind, expected and actual metadata when shown, callback phase, wrapper/driver version, and relation identity.\u003c/p\u003e"},{"anchor":"diagnosis","heading":"Diagnosis","html":"\u003cp\u003eCompare the descriptor supplied by the wrapper with the descriptor expected by the callback or consumer. Check schema changes, type and column order, nullability or length metadata only when the wrapper reports them; do not infer a mismatch from a generic conversion failure.\u003c/p\u003e"},{"anchor":"response","heading":"Response","html":"\u003cp\u003eCorrect the wrapper's descriptor construction or the remote/schema contract it actually identifies, then recreate the affected plan or object. Repeating the same operation without changing the mismatched metadata will not repair the descriptor.\u003c/p\u003e"},{"anchor":"versions","heading":"Versions","html":"\u003cp\u003e\u003ccode\u003eHV021\u003c/code\u003e is present in the locked definition snapshots from 9.1.24 through 18.6 and 19 Beta 3, with \u003ccode\u003eknown_present_by\u003c/code\u003e 9.1.0. The available pre-9 definition material does not establish an exact introduction release.\u003c/p\u003e"},{"anchor":"related","heading":"Related","html":"\u003cp\u003e\u003ca href=\"/wiki/sqlstate/HV008/\"\u003e\u003ccode\u003eHV008\u003c/code\u003e\u003c/a\u003e concerns an FDW column sequence; \u003ca href=\"/wiki/sqlstate/HV091/\"\u003e\u003ccode\u003eHV091\u003c/code\u003e\u003c/a\u003e concerns a descriptor field identifier; \u003ca href=\"/wiki/sqlstate/HV024/\"\u003e\u003ccode\u003eHV024\u003c/code\u003e\u003c/a\u003e concerns an attribute value.\u003c/p\u003e"},{"anchor":"sources","heading":"Sources","html":"\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/errcodes.txt#L463\"\u003e\u003ccode\u003eerrcodes.txt\u003c/code\u003e\u003c/a\u003e — definition, SHA-256 \u003ccode\u003e6e8de346643ba84aa3c9c6a73360acfc7b2dfb89162c06c08ce9bf5bcd5bbcba\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/include/foreign/fdwapi.h#L24-L55\"\u003e\u003ccode\u003efdwapi.h\u003c/code\u003e\u003c/a\u003e — generic FDW callback boundary.\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#sources\"\u003eStructured evidence\u003c/a\u003e — fixed 18.6 sources and bounded scan.\u003c/li\u003e\n\u003c/ul\u003e"}],"summary":"HV021 identifies inconsistent information in an FDW descriptor. The 18.6 core/contrib call scan has no resolved HV021 report group, so it does not identify a core descriptor check or message.","title":"HV021 — fdw_inconsistent_descriptor_information","translation_source_rev":"af6089bb08bf725076272e276e55cab6d37ebba8195be3302e78596e0f6dbb87"}},"RequestedLocale":"en","Fallback":false,"Versions":["10","11","12","13","14","15","16","17","18","19","20","9.1","9.2","9.3","9.4","9.5","9.6"],"Locales":["en","zh-Hans"],"Signatures":null,"Spellings":null,"SQLState":{"aliases":[],"catalogue_notes":{"earliest_observed":"9.1.0","formal_scope":"9.0.0..18.6","latest_observed":"18.6","matrix_scope":["9.0.23","9.1.24","9.2.24","9.3.25","9.4.26","9.5.25","9.6.24","10.23","11.22","12.22","13.23","14.24","15.19","16.15","17.11","18.6"],"pre9_scope":{"formal_tag_count":191,"maximum_release":"8.4.22","minimum_release":"7.0.0","source_definition_count":153,"source_doc_count":153,"source_file_count":306,"source_scope":"7.4..8.4 definition files; 7.0..7.3 candidate-path source gap probes","source_tag_count":153},"pre9_status":"not_observed","preview_scope":["19beta3"]},"class":"HV","class_name":"Foreign Data Wrapper Error (SQL/MED)","condition_name":"fdw_inconsistent_descriptor_information","condition_names":["fdw_inconsistent_descriptor_information"],"definition_changes":[],"english_manuals":{"10":{"aliases":[],"class_name":"Foreign Data Wrapper Error (SQL/MED)","condition_name":"fdw_inconsistent_descriptor_information","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"9607b57e9f639b61785677ba4d226f5889fe1d19c8bf55a3337691899a9073cd","slug":"10"},"lang":"en","sqlstate":"HV021"},"11":{"aliases":[],"class_name":"Foreign Data Wrapper Error (SQL/MED)","condition_name":"fdw_inconsistent_descriptor_information","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"3a024e38263ad77de228eed7930b842b42dc1d5cab9ca3727be8eed872ec9539","slug":"11"},"lang":"en","sqlstate":"HV021"},"12":{"aliases":[],"class_name":"Foreign Data Wrapper Error (SQL/MED)","condition_name":"fdw_inconsistent_descriptor_information","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"1444bd6a138537cd75be88a220ee9472ac528f0cfc58758e49636d85455efe98","slug":"12"},"lang":"en","sqlstate":"HV021"},"13":{"aliases":[],"class_name":"Foreign Data Wrapper Error (SQL/MED)","condition_name":"fdw_inconsistent_descriptor_information","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"4a3ef8af218e5736dfde8660ba609e84233b6b3bac7e0210ff8724cf1b27b2db","slug":"13"},"lang":"en","sqlstate":"HV021"},"14":{"aliases":[],"class_name":"Foreign Data Wrapper Error (SQL/MED)","condition_name":"fdw_inconsistent_descriptor_information","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"1c12e83304e0f4ff64c9d98ca5e3007df6756932ed19867a4fa0e0650f6c5751","slug":"14"},"lang":"en","sqlstate":"HV021"},"15":{"aliases":[],"class_name":"Foreign Data Wrapper Error (SQL/MED)","condition_name":"fdw_inconsistent_descriptor_information","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"2161f58f6e87f6535b3b1f3d4661427bb6765f4f6b074fcc16fac97594b50599","slug":"15"},"lang":"en","sqlstate":"HV021"},"16":{"aliases":[],"class_name":"Foreign Data Wrapper Error (SQL/MED)","condition_name":"fdw_inconsistent_descriptor_information","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"928e705933d7c3d018ae3fba9d800b34e6325746d157339dce878473c519d100","slug":"16"},"lang":"en","sqlstate":"HV021"},"17":{"aliases":[],"class_name":"Foreign Data Wrapper Error (SQL/MED)","condition_name":"fdw_inconsistent_descriptor_information","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"868135520af87351e3ea1ba42656111cbd2d157d98e1fef05ea158ac5729d8b1","slug":"17"},"lang":"en","sqlstate":"HV021"},"18":{"aliases":[],"class_name":"Foreign Data Wrapper Error (SQL/MED)","condition_name":"fdw_inconsistent_descriptor_information","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"56dacf78e618ff0fd8c533e05db597b80d7ebbad7f8e512a888217d0640aa328","slug":"18"},"lang":"en","sqlstate":"HV021"},"19":{"aliases":[],"class_name":"Foreign Data Wrapper Error (SQL/MED)","condition_name":"fdw_inconsistent_descriptor_information","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"63fb8d1aa9f494eeab9d0f8542a2b673f7746ee41ae2689d19403cb3cc425a5c","slug":"19"},"lang":"en","sqlstate":"HV021"},"20":{"aliases":[],"class_name":"Foreign Data Wrapper Error (SQL/MED)","condition_name":"fdw_inconsistent_descriptor_information","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"0d3f602127cd137cf343b32d5fa78f175eeb6cdcb6353b1f6f998ede6cb7b911","slug":"devel"},"lang":"en","sqlstate":"HV021"},"9.1":{"aliases":[],"class_name":"Foreign Data Wrapper Error (SQL/MED)","condition_name":"fdw_inconsistent_descriptor_information","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"2d118b06c3b644c28b3ddefe9e4bef99a180321582209332372a5318f5bf8d1c","slug":"9.1"},"lang":"en","sqlstate":"HV021"},"9.2":{"aliases":[],"class_name":"Foreign Data Wrapper Error (SQL/MED)","condition_name":"fdw_inconsistent_descriptor_information","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"2a37575b39c858d37c58fc4de6a16109554fd3306602294180d78faa1170d2cd","slug":"9.2"},"lang":"en","sqlstate":"HV021"},"9.3":{"aliases":[],"class_name":"Foreign Data Wrapper Error (SQL/MED)","condition_name":"fdw_inconsistent_descriptor_information","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"2214b6869d764f7fba7221aefcdf1ab049b55ad51d63aa52054f3cd2c2533ae9","slug":"9.3"},"lang":"en","sqlstate":"HV021"},"9.4":{"aliases":[],"class_name":"Foreign Data Wrapper Error (SQL/MED)","condition_name":"fdw_inconsistent_descriptor_information","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"7243e2d653befe88733222ede67958f0c4b7fae967b58eb97807aeb3f32b4096","slug":"9.4"},"lang":"en","sqlstate":"HV021"},"9.5":{"aliases":[],"class_name":"Foreign Data Wrapper Error (SQL/MED)","condition_name":"fdw_inconsistent_descriptor_information","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"d40bc67cb331f1e4ccc0821ff57832c6c230edb0dce3ba4249defd21ae7ea29d","slug":"9.5"},"lang":"en","sqlstate":"HV021"},"9.6":{"aliases":[],"class_name":"Foreign Data Wrapper Error 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