Fix tpch benchmark harness (#19033)

## Which issue does this PR close?

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- Closes #19032

## Rationale for this change

See #19032

## What changes are included in this PR?

Fix binary
## Are these changes tested?

I tested them manually

## Are there any user-facing changes?

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Author: alamb

benchmarks/src/tpch/run.rs

@@ -93,12 +93,8 @@ pub struct RunOpt {
     prefer_hash_join: BoolDefaultTrue,
 
     /// If true then Piecewise Merge Join can be used, if false then it will opt for Nested Loop Join
-    /// True by default.
-    #[structopt(
-        short = "j",
-        long = "enable_piecewise_merge_join",
-        default_value = "false"
-    )]
+    /// False by default.
+    #[structopt(long = "enable_piecewise_merge_join", default_value = "false")]
     enable_piecewise_merge_join: BoolDefaultTrue,
 
     /// Mark the first column of each table as sorted in ascending order.