ddl parse error: dup col

[vagetablechicken]

create database db;
use db;
create table t1(c1 int);
create table t2(c1 int);
create table t3(c1 int);
deploy d2 select * from t1 last join t2 on t1.c1=t2.c1 and t1.c1=t2.c1;
-- error: Error: [2000] table [db.t2] add index failed. duplicated col c1
deploy d2 select * from t1 last join t2 on t1.c1=t2.c1 last join t3 on t1.c1=t3.c1 and t2.c1=t3.c1;
-- error too

[vagetablechicken]

OpenMLDB/hybridse/src/passes/physical/group_and_sort_optimized.cc

Line 452 in 1448df8

plan_ctx_->index_hints()->Report(scan_op->GetDb(), scan_op->GetName(), keys,

hints will report keys [c1,c1], so we will try to create index key=(c1,c1), error.

[vagetablechicken]

dedup in ddl parser