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To reproduce, first run the following program, passing itpostgresql://my_postgres_server as an argument:
[dependencies]postgres ="=0.19.11"tokio-postgres ="=0.7.14"
fnmain(){letmut client = postgres::Client::connect(&std::env::args().nth(1).unwrap(), postgres::NoTls).unwrap();let row = client.query_one("SELECT 42::int4",&[]).unwrap();let _v:i64 = row.get(0);}
It will produce the following informative error message:
thread 'main' (11016648) panicked at src/main.rs:4:23:error retrieving column 0: error deserializing column 0: cannot convert between the Rust type `i64` and the Postgres type `int4`Now changetokio-postgres version to 0.7.15:
[dependencies]postgres ="=0.19.11"tokio-postgres ="=0.7.15"
and run it again.
It will output an uninformative error message:
thread 'main' (11011839) panicked at src/main.rs:4:23:error retrieving column 0: error deserializing column 0Metadata
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