PL/Container crashed when convert R data.frame to text[]

[HaozhouWang]

Function:

 create or replace function test_dta() returns text[] as
$$
# container:  plc_r_shared
as.data.frame(array(1:10,c(2,5)))
$$ language plcontainer;

Output:

select test_dta();
ERROR:  plcontainer: Error receiving data from the client. Maybe retry later. (plcontainer.c:336)
CONTEXT:  PLContainer function "test_dta"

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[xuebinsu]

The root cause of this issue is that when RClient returns the result as a text[], it assumes that the returning value of the R function is a string and uses STRING_ELT() to access its elements. However, for this R function, this is not true since the return value is a data.frame. Thus, using STRING_ELT() would cause a type error and crash RClient.