Filtering SQLite and data.frame give different results when using OR (`|`)

[EricEdwardBryant]

In reference to - http://stackoverflow.com/questions/28205184/

library(dplyr)
packageVersion('dplyr')
# [1] ‘0.4.1’

df <- tbl_df(data.frame(
  v1 = c('a', 'b', 'a', 'b'),
  v2 = c('b', 'a', 'a', 'b'),
  v3 = month.abb[1:4]))

db <- copy_to(src_sqlite('example.sqlite', create = TRUE), df)

filter(df, v1 == 'a' | v2 == 'a', v3 == 'Jan') 
# Source: local data frame [1 x 3]
#
#   v1 v2  v3
#1  a  b Jan

filter(db, v1 == 'a' | v2 == 'a', v3 == 'Jan')
# Source: sqlite 3.8.6 [example.sqlite]
# From: df [2 x 3]
# Filter: v1 == "a" | v2 == "a", v3 == "Jan" 
#
#  v1 v2  v3
#1  a  b Jan
#2  a  a Mar

filter(db, v1 == 'a' | v2 == 'a', v3 == 'Jan') %>% show_query()
# <SQL>
#   SELECT "v1", "v2", "v3"
# FROM "df"
# WHERE "v1" = 'a' OR "v2" = 'a' AND "v3" = 'Jan'

filter(db, (v1 == 'a' | v2 == 'a'), v3 == 'Jan')
# Source: sqlite 3.8.6 [example.sqlite]
# From: df [1 x 3]
# Filter: (v1 == "a" | v2 == "a"), v3 == "Jan" 
# 
# v1 v2  v3
#1  a  b Jan

Filtering the data.frame returns 1 row (as expected), whereas filtering the database returns 2 rows. This is fixed by adding explicit parentheses around the argument containing the OR expression in filter when querying the database. Perhaps ... arguments given to filter should be implicitly wrapped in parentheses?