add hint in README of example (#3358)

apache · Sep 5, 2022 · 4c948a3 · 4c948a3
1 parent bb08d31
commit 4c948a3
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diff --git a/datafusion-examples/examples/README.md b/datafusion-examples/examples/README.md
@@ -19,6 +19,10 @@
 
 # DataFusion Examples
 
+Prerequisites:
+
+Run `git submodule update --init` to init test files.
+
 ## Single Process
 
 The examples `csv_sql.rs` and `parquet_sql.rs` demonstrate building a query plan from a SQL statement and then executing the query plan against local CSV and Parquet files, respectively.