Merge branch 'dmius-l003-fix' into 'master'

fix: errors in F004 (division by zero) and L003 (bugs on MacOS)  fixed

See merge request postgres-ai/postgres-checkup!393

Author: dmius

resources/checks/F004_heap_bloat.sh

@@ -72,7 +72,7 @@ with data as (
       tblpages * bs as real_size,
       (tblpages - est_tblpages) * bs as extra_size,
       case
-        when tblpages - est_tblpages > 0
+        when (tblpages - est_tblpages > 0 and tblpages > 0)
           then 100 * (tblpages - est_tblpages) / tblpages::float
         else 0
       end as extra_ratio,
@@ -82,7 +82,7 @@ with data as (
         else 0
       end as bloat_size,
       case
-        when tblpages - est_tblpages_ff > 0
+        when (tblpages - est_tblpages_ff > 0 and tblpages > 0)
           then 100 * (tblpages - est_tblpages_ff) / tblpages::float
         else 0
       end as bloat_ratio

resources/checks/L003_integer_in_pk.sh

@@ -77,7 +77,7 @@ SQL
 result=$(cat $f_stderr)
 result=${result:23:$((${#result}))}
 tables_data=$(echo "$result" | jq -cs 'sort_by(-(.[]."capacity_used_percent"|tonumber)) | .[]' | jq -s add)
-let "min_table_size_bytes=$MIN_RELPAGES * 8192"
+min_table_size_bytes=$((MIN_RELPAGES * 8192))
 
 echo "{\"tables\": $tables_data, \"min_table_size_bytes\": $min_table_size_bytes }"