kumarUjjawal commented on code in PR #22417:
URL: https://github.com/apache/datafusion/pull/22417#discussion_r3289379563
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datafusion-examples/examples/custom_data_source/custom_datasource.rs:
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@@ -53,6 +53,20 @@ pub async fn custom_datasource() -> Result<()> {
search_accounts(db.clone(), Some(col("bank_account").gt(lit(8000u64))),
1).await?;
search_accounts(db.clone(), Some(col("bank_account").gt(lit(200u64))),
2).await?;
+ // exercise SQL paths that push down non-trivial projections:
+ // - `SELECT 1 ...` requests no source columns (projection: Some([]))
+ // - `SELECT COUNT(id) ...` requests a single column (projection:
Some([0]))
+ let ctx = SessionContext::new();
+ ctx.register_table("accounts", Arc::new(db))?;
+ ctx.sql("SELECT 1 AS a FROM accounts")
Review Comment:
Thanks! Added the actual values check.
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