feat: implement more expr_to_sql functionality

README.md

@@ -83,6 +83,7 @@ Default features:
 - `parquet`: support for reading the [Apache Parquet] format
 - `regex_expressions`: regular expression functions, such as `regexp_match`
 - `unicode_expressions`: Include unicode aware functions such as `character_length`
+- `unparser` : enables support to reverse LogicalPlans back into SQL
 
 Optional features:
 

datafusion/sql/Cargo.toml

@@ -33,11 +33,13 @@ name = "datafusion_sql"
 path = "src/lib.rs"
 
 [features]
-default = ["unicode_expressions"]
+default = ["unicode_expressions", "unparser"]
 unicode_expressions = []
+unparser = []
 
 [dependencies]
 arrow = { workspace = true }
+arrow-array = { workspace = true }
 arrow-schema = { workspace = true }
 datafusion-common = { workspace = true, default-features = true }
 datafusion-expr = { workspace = true }

datafusion/sql/src/lib.rs

@@ -36,6 +36,7 @@ mod relation;
 mod select;
 mod set_expr;
 mod statement;
+#[cfg(feature = "unparser")]
 pub mod unparser;
 pub mod utils;
 mod values;