Uncycle dependencies

Signed-off-by: Adam Gutglick <adam@spiraldb.com>

Author: AdamGS

vortex-btrblocks/src/schemes/variant/json_to_variant.rs

@@ -36,8 +36,6 @@ mod parquet_variant_children {
     pub const METADATA: usize = 0;
     /// The raw Parquet Variant value child.
     pub const VALUE: usize = 1;
-    /// The raw Parquet Variant typed_value child.
-    pub const TYPED_VALUE: usize = 2;
 }
 
 impl Scheme for JsonToVariantScheme {
@@ -111,20 +109,12 @@ impl Scheme for JsonToVariantScheme {
             })
             .transpose()?;
 
-        // This is currently always none, but we should make sure to compress it
-        // if it exists
-        let typed_value = parquet_variant
-            .typed_value_array()
-            .map(|typed| {
-                compressor.compress_child(
-                    typed,
-                    &compress_ctx,
-                    self.id(),
-                    parquet_variant_children::TYPED_VALUE,
-                    exec_ctx,
-                )
-            })
-            .transpose()?;
+        // `VariantToJson` can only decode unshredded storage, so producing a typed_value child
+        // here would create an array that fails at decompression time.
+        vortex_ensure!(
+            parquet_variant.typed_value_array().is_none(),
+            "JsonToVariantScheme does not support shredded (typed_value) Parquet Variant storage"
+        );
 
         let variant_validity = parquet_variant
             .validity()?
@@ -133,7 +123,7 @@ impl Scheme for JsonToVariantScheme {
             variant_validity,
             compressed_metadata,
             compressed_value,
-            typed_value,
+            None,
         )?
         .into_array();