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Diffstat (limited to 'src/include/utils/varbit.h')
| -rw-r--r-- | src/include/utils/varbit.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/include/utils/varbit.h b/src/include/utils/varbit.h index 2a4ec67698e..c4ae4685865 100644 --- a/src/include/utils/varbit.h +++ b/src/include/utils/varbit.h @@ -21,6 +21,11 @@ /* * Modeled on struct varlena from postgres.h, but data type is bits8. + * + * Caution: if bit_len is not a multiple of BITS_PER_BYTE, the low-order + * bits of the last byte of bit_dat[] are unused and MUST be zeroes. + * (This allows bit_cmp() to not bother masking the last byte.) + * Also, there should not be any excess bytes counted in the header length. */ typedef struct { |