Revert making parquet::data_type and parquet::arrow::schema experimental

Author: tustvold

parquet/src/arrow/mod.rs

@@ -131,7 +131,6 @@ pub use self::arrow_reader::ArrowReader;
 pub use self::arrow_reader::ParquetFileArrowReader;
 pub use self::arrow_writer::ArrowWriter;
 
-#[cfg(feature = "experimental")]
 pub use self::schema::{
     arrow_to_parquet_schema, parquet_to_arrow_schema, parquet_to_arrow_schema_by_columns,
     parquet_to_arrow_schema_by_root_columns,

parquet/src/lib.rs

@@ -56,7 +56,9 @@ macro_rules! experimental_mod {
 #[macro_use]
 pub mod errors;
 pub mod basic;
-experimental_mod!(data_type, #[macro_use]);
+
+#[macro_use]
+pub mod data_type;
 
 // Exported for external use, such as benchmarks
 #[cfg(feature = "experimental")]