Fuzzer: Virtuoso 7.2.12 crashed at `xte_replace_strings_with_unames`.
It can also be reproduced with Version 7.2.13-dev.3239-pthreads as of Mar 17 2024 (da40b02).

PoC:
```SQL
SELECT x FROM ( SELECT 3421 x ) x ORDER BY ( xmlagg ( json_parse ( '[[1]]' ) ) );
```

backtrace:
```c
#0 0xb45ea1 (xte_replace_strings_with_unames+0x81)
#1 0xc11d44 (bif_xte_nodebld_final_impl+0x364)
#2 0x755284 (ins_call_bif+0xc4)
#3 0x763149 (code_vec_run_1+0xdf9)
#4 0x7b9121 (qn_input+0x3c1)
#5 0x7cd35a (qr_subq_exec+0x94a)
#6 0x756241 (ins_call+0xc91)
#7 0x757c30 (ins_call_vec+0x320)
#8 0x75b445 (code_vec_run_v+0xa25)
#9 0x7b90ef (qn_input+0x38f)
#10 0x7b985f (qn_ts_send_output+0x23f)
#11 0x52e956 (memcache_read_input+0x866)
#12 0x4369b0 (chash_read_input+0x770)
#13 0x7b912e (qn_input+0x3ce)
#14 0x7b9596 (qn_send_output+0x236)
#15 0x7b912e (qn_input+0x3ce)
#16 0x7c68fb (fun_ref_node_input+0x36b)
#17 0x7b912e (qn_input+0x3ce)
#18 0x7b9596 (qn_send_output+0x236)
#19 0x82bd7d (set_ctr_vec_input+0x99d)
#20 0x7b912e (qn_input+0x3ce)
#21 0x7ca91b (qr_exec+0x11db)
#22 0x7d82b6 (sf_sql_execute+0x11a6)
#23 0x7d8dbe (sf_sql_execute_w+0x17e)
#24 0x7e1a7d (sf_sql_execute_wrapper+0x3d)
#25 0xe2a11c (future_wrapper+0x3fc)
#26 0xe31a1e (_thread_boot+0x11e)
#27 0x7f84026c3609 (start_thread+0xd9)
#28 0x7f8402493353 (clone+0x43)
```

ways to reproduce (write poc to the file /tmp/test.sql first):
```bash
# remove the old one
docker container rm virtdb_test -f
# start virtuoso through docker
docker run --name virtdb_test -itd --env DBA_PASSWORD=dba  pkleef/virtuoso-opensource-7
# wait the server starting
sleep 10
# check whether the simple query works
echo "SELECT 1;" | docker exec -i virtdb_test isql 1111 dba
# run the poc
cat /tmp/test.sql | docker exec -i virtdb_test isql 1111 dba
```
Fuzzer: Virtuoso 7.2.12 crashed at `xte_replace_strings_with_unames`
This is a GitHub Issue
repo:virtuoso-opensource
owner:openlink
Title : Fuzzer: Virtuoso 7.2.12 crashed at `xte_replace_strings_with_unames`
Issue date:

--- start body ---
Fuzzer: Virtuoso 7.2.12 crashed at `xte_replace_strings_with_unames`.
It can also be reproduced with Version 7.2.13-dev.3239-pthreads as of Mar 17 2024 (da40b02).

PoC:
```SQL
SELECT x FROM ( SELECT 3421 x ) x ORDER BY ( xmlagg ( json_parse ( '[[1]]' ) ) );
```

backtrace:
```c
#0 0xb45ea1 (xte_replace_strings_with_unames+0x81)
#1 0xc11d44 (bif_xte_nodebld_final_impl+0x364)
#2 0x755284 (ins_call_bif+0xc4)
#3 0x763149 (code_vec_run_1+0xdf9)
#4 0x7b9121 (qn_input+0x3c1)
#5 0x7cd35a (qr_subq_exec+0x94a)
#6 0x756241 (ins_call+0xc91)
#7 0x757c30 (ins_call_vec+0x320)
#8 0x75b445 (code_vec_run_v+0xa25)
#9 0x7b90ef (qn_input+0x38f)
#10 0x7b985f (qn_ts_send_output+0x23f)
#11 0x52e956 (memcache_read_input+0x866)
#12 0x4369b0 (chash_read_input+0x770)
#13 0x7b912e (qn_input+0x3ce)
#14 0x7b9596 (qn_send_output+0x236)
#15 0x7b912e (qn_input+0x3ce)
#16 0x7c68fb (fun_ref_node_input+0x36b)
#17 0x7b912e (qn_input+0x3ce)
#18 0x7b9596 (qn_send_output+0x236)
#19 0x82bd7d (set_ctr_vec_input+0x99d)
#20 0x7b912e (qn_input+0x3ce)
#21 0x7ca91b (qr_exec+0x11db)
#22 0x7d82b6 (sf_sql_execute+0x11a6)
#23 0x7d8dbe (sf_sql_execute_w+0x17e)
#24 0x7e1a7d (sf_sql_execute_wrapper+0x3d)
#25 0xe2a11c (future_wrapper+0x3fc)
#26 0xe31a1e (_thread_boot+0x11e)
#27 0x7f84026c3609 (start_thread+0xd9)
#28 0x7f8402493353 (clone+0x43)
```

ways to reproduce (write poc to the file /tmp/test.sql first):
```bash
# remove the old one
docker container rm virtdb_test -f
# start virtuoso through docker
docker run --name virtdb_test -itd --env DBA_PASSWORD=dba  pkleef/virtuoso-opensource-7
# wait the server starting
sleep 10
# check whether the simple query works
echo "SELECT 1;" | docker exec -i virtdb_test isql 1111 dba
# run the poc
cat /tmp/test.sql | docker exec -i virtdb_test isql 1111 dba
```
--- end body ---
