fix doc

Author: paleolimbot

datafusion/common/src/metadata.rs

@@ -31,7 +31,7 @@ use hashbrown::HashMap;
 /// # Example: Create [`FieldMetadata`] from a [`Field`]
 /// ```
 /// # use std::collections::HashMap;
-/// # use datafusion_expr::expr::FieldMetadata;
+/// # use datafusion_common::metadata::FieldMetadata;
 /// # use arrow::datatypes::{Field, DataType};
 /// # let field = Field::new("c1", DataType::Int32, true)
 /// #  .with_metadata(HashMap::from([("foo".to_string(), "bar".to_string())]));
@@ -43,7 +43,7 @@ use hashbrown::HashMap;
 ///
 /// # Example: Update a [`Field`] with [`FieldMetadata`]
 /// ```
-/// # use datafusion_expr::expr::FieldMetadata;
+/// # use datafusion_common::metadata::FieldMetadata;
 /// # use arrow::datatypes::{Field, DataType};
 /// # let field = Field::new("c1", DataType::Int32, true);
 /// # let metadata = FieldMetadata::new_from_field(&field);
@@ -96,7 +96,7 @@ impl FieldMetadata {
     ///
     /// # Example usage
     /// ```rust
-    /// use datafusion_expr::expr::FieldMetadata;
+    /// use datafusion_common::metadata::FieldMetadata;
     /// use std::collections::BTreeMap;
     ///
     /// // Create metadata for a literal expression

datafusion/expr/src/expr.rs

@@ -1623,7 +1623,7 @@ impl Expr {
     /// ```
     /// # use datafusion_expr::col;
     /// # use std::collections::HashMap;
-    /// # use datafusion_expr::expr::FieldMetadata;
+    /// # use datafusion_common::metadata::FieldMetadata;
     /// let metadata = HashMap::from([("key".to_string(), "value".to_string())]);
     /// let metadata = FieldMetadata::from(metadata);
     /// let expr = col("foo").alias_with_metadata("bar", Some(metadata));
@@ -1655,7 +1655,7 @@ impl Expr {
     /// ```
     /// # use datafusion_expr::col;
     /// # use std::collections::HashMap;
-    /// # use datafusion_expr::expr::FieldMetadata;
+    /// # use datafusion_common::metadata::FieldMetadata;
     /// let metadata = HashMap::from([("key".to_string(), "value".to_string())]);
     /// let metadata = FieldMetadata::from(metadata);
     /// let expr = col("foo").alias_qualified_with_metadata(Some("tbl"), "bar", Some(metadata));