Why not .data in sql filter?

gistfile1.R

library(tidyverse)

# local df works as expected with or without .data
mtcars %>% select(mpg) %>% filter(mpg > 33)
#    mpg
# 1 33.9
mtcars %>% select(.data$mpg) %>% filter(.data$mpg > 33)
#    mpg
# 1 33.9


con = DBI::dbConnect(RSQLite::SQLite(), path = ":memory:")
copy_to(con, mtcars, "carsql", temporary=F)

# sql works as expected without .data
tbl(con, "carsql") %>% select(mpg) %>% filter(mpg > 33)
# # Source: lazy query [?? x 1]
# # Database: sqlite 3.19.3 []
#     mpg
#   <dbl>
# 1  33.9

# sql select works as expected with .data
tbl(con, "carsql") %>% select(.data$mpg) %>% filter(mpg > 33)
# # Source: lazy query [?? x 1]
# # Database: sqlite 3.19.3 []
#     mpg
#   <dbl>
# 1  33.9

# sql filter does not work with .data
tbl(con, "carsql") %>% select(.data$mpg) %>% filter(.data$mpg > 33)
# Error in eval_bare(call, env) : object '.data' not found

Possibly related to dplyr issue 2930.