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This forces an input field containing the quoted null string to be returned as a NULL. Without this option, only unquoted null strings behave this way. This helps where some CSV producers insist on quoting every field, whether or not it is needed. The option takes a list of fields, and only applies to those columns. There is an equivalent column-level option added to file_fdw. Ian Barwick, with some tweaking by Andrew Dunstan, reviewed by Payal Singh.
86 B
86 B
| 1 | AAA | aaa | 123 | |
|---|---|---|---|---|
| 2 | XYZ | xyz | 321 | |
| 3 | NULL | NULL | NULL | NULL |
| 4 | NULL | NULL | NULL | NULL |
| 5 | ABC | abc |