Navis Ryu

Doing https://github.com/metatron-app/metatron-discovery/issues/4061, I've found many of functions in apache calcite lacks operand type inferrer, throwing exception for dynamic parameters in validation stage. I've done some hacks for fixing them but...

Optionize max vertices for buffer operator

1

Not a big deal but somtimes default max vertices (96) makes too huge polygon than expected.

for #189

Got bigger than expected

Based on TAJO-1460 & TAJO-1484

Preliminary patch

Now ExternalSortExec cleans memory scanner when it's not needed

applied to all

Remove header for dictionary if possible

1

introduce new flag NO_OFFSET for dictionary writer when difference of min length and max length if small (like