Postgres: Add missing comma to build_sql call used translate paste()

[rbdixon]

con = src_postgres()
data = copy_to(con, tbl_df( data.frame(l=LETTERS)), name = dplyr:::random_table_name() )
print( summarize(data, m=paste(l, collapse="/")))

The code above fails yielding:

Error in postgresqlExecStatement(conn, statement, ...) :
RS-DBI driver: (could not Retrieve the result : ERROR:  type "l" does not exist
LINE 2: FROM (SELECT string_agg("l"'/') AS "m"

Simply missing a comma. With this patch applied you get the expected:

Source: postgres 9.4.4 [gt5392c@localhost:5432/gt5392c]
From: <derived table> [?? x 1]
   m
1  A/B/C/D/E/F/G/H/I/J/K/L/M/N/O/P/Q/R/S/T/U/V/W/X/Y/Z
..                                                 ...

[hadley]

Nice. Could you please also add a bullet to NEWS? It should go in the databases section and look like * brief description (@yourusername, #thisissue)

[rbdixon]

Done.

[hadley]

Thanks!

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