morrySnow 2398cd3bb6 [enhancement](Nereids)print slot name in explain string (#12272) ...

Currently, explain string print all expression as slot id, e.g. `<slot 1>`.
This PR, print its name with slot id instead, e.g. `column_a[#1]`. For details:
- print qualified table name for OlapScanNode
- print NamedExpression name with SlotId instead of just SlotId
- OlapScanNode's node name use "OlapScanNode" instead of table name

2022-09-05 11:31:35 +08:00

..

main

[enhancement](Nereids)print slot name in explain string (#12272)

2022-09-05 11:31:35 +08:00

test

[enhancement](Nereids)print slot name in explain string (#12272)

2022-09-05 11:31:35 +08:00