EC
HV090
PostgreSQLERRORNotableForeign Data Wrapper ErrorHIGH confidence

fdw_invalid_string_length_or_buffer_length

What this means

A foreign data wrapper encountered an invalid string length or buffer length value, indicating either a length of zero, negative, or exceeding allowed bounds.

Why it happens
  1. 1String length of zero passed where a non-empty string is required
  2. 2Buffer length value is negative or exceeds maximum
  3. 3FDW C code computed an incorrect buffer size for string data
How to reproduce

FDW string or buffer operations during query execution or option processing

trigger — this will error
trigger — this will error
SELECT * FROM my_foreign_table;  -- FDW buffer sizing error

expected output

ERROR:  HV090: fdw_invalid_string_length_or_buffer_length

Fix

Update the FDW extension

WHEN FDW has a string length calculation bug

Update the FDW extension
ALTER EXTENSION my_fdw UPDATE;

Why this works

Installs a corrected version of the FDW with proper buffer length handling

What not to do

✕ Do not pass empty strings to FDW options that require non-empty values

Zero-length strings can trigger this error in strict FDW implementations

Sources
Official documentation ↗

https://www.postgresql.org/docs/current/errcodes-appendix.html

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