niebayes commented on code in PR #14723:
URL: https://github.com/apache/datafusion/pull/14723#discussion_r1960056475
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datafusion/substrait/src/serializer.rs:
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@@ -26,9 +26,30 @@ use substrait::proto::Plan;
use std::fs::OpenOptions;
use std::io::{Read, Write};
+use std::path::Path;
-pub async fn serialize(sql: &str, ctx: &SessionContext, path: &str) ->
Result<()> {
+/// Plans a sql and serializes the generated logical plan to bytes.
+/// The bytes are then written into a file at `path`.
+///
+/// Returns an error if the file already exists and is not empty.
+pub async fn serialize(
+ sql: &str,
+ ctx: &SessionContext,
+ path: impl AsRef<Path>,
+) -> Result<()> {
let protobuf_out = serialize_bytes(sql, ctx).await;
+
+ match std::fs::metadata(path.as_ref()) {
+ Ok(meta) if meta.len() > 0 => {
+ return Err(DataFusionError::Substrait(format!(
+ "Failed to encode substrait plan: the file {} already exists
and is not empty",
Review Comment:
Adding a `substrait` is because there already had an error message "Failed
to encode substrait plan" in the fuction `serialize_bytes`. I was following
that error message to make error messages consistent.
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