Fix directory table ci test unstable.

As two directory schema tables have the approximately the same in tuples
count, the join plan is unstable. We fix this by adding more tuples to
one schema table.

Authored-by: Zhang Wenchao zwcpostgres@gmail.com

Author: zhangwenchao-123

src/test/regress/input/directory_table.source

@@ -318,6 +318,19 @@ SELECT relative_path, size, tag FROM dir_table2 ORDER BY 1;
 \COPY BINARY dir_table1 FROM '@abs_srcdir@/data/nation.csv' 'nation3' WITH TAG 'nation2';    -- fail
 \COPY BINARY dir_table1 FROM '@abs_srcdir@/data/nation.csv' 'nation4' WITH TAG 'nation';
 \COPY BINARY dir_table1 FROM '@abs_srcdir@/data/nation.csv' 'nation5' WITH TAG 'nation' WITH TAG 'nation2';    -- fail
+\COPY BINARY dir_table1 FROM '@abs_srcdir@/data/nation.csv' 'nation6';
+\COPY BINARY dir_table1 FROM '@abs_srcdir@/data/nation.csv' 'nation7';
+\COPY BINARY dir_table1 FROM '@abs_srcdir@/data/nation.csv' 'nation8';
+\COPY BINARY dir_table1 FROM '@abs_srcdir@/data/nation.csv' 'nation9';
+\COPY BINARY dir_table1 FROM '@abs_srcdir@/data/nation.csv' 'nation10';
+\COPY BINARY dir_table1 FROM '@abs_srcdir@/data/nation.csv' 'nation11';
+\COPY BINARY dir_table1 FROM '@abs_srcdir@/data/nation.csv' 'nation12';
+\COPY BINARY dir_table1 FROM '@abs_srcdir@/data/nation.csv' 'nation13';
+\COPY BINARY dir_table1 FROM '@abs_srcdir@/data/nation.csv' 'nation14';
+\COPY BINARY dir_table1 FROM '@abs_srcdir@/data/nation.csv' 'nation15';
+\COPY BINARY dir_table1 FROM '@abs_srcdir@/data/nation.csv' 'nation16';
+\COPY BINARY dir_table1 FROM '@abs_srcdir@/data/nation.csv' 'nation17';
+\COPY BINARY dir_table1 FROM '@abs_srcdir@/data/nation.csv' 'nation18';
 SELECT relative_path, size, tag FROM dir_table1 ORDER BY 1;
 SELECT relative_path, content FROM directory_table('dir_table1') ORDER BY 1;