chore(rust): remove wasm-timer dependency (#10347)

crates/polars-core/Cargo.toml

@@ -47,9 +47,6 @@ serde_json = "1"
 [build-dependencies]
 version_check = { workspace = true }
 
-[target.'cfg(target_family = "wasm")'.dependencies]
-wasm-timer = "0.2.5"
-
 [features]
 simd = ["arrow/simd", "polars-arrow/simd"]
 nightly = ["simd", "hashbrown/nightly", "polars-utils/nightly", "polars-arrow/nightly"]

crates/polars-core/src/chunked_array/logical/categorical/builder.rs

@@ -13,7 +13,7 @@ use crate::{using_string_cache, StringCache, POOL};
 pub enum RevMappingBuilder {
     /// Hashmap: maps the indexes from the global cache/categorical array to indexes in the local Utf8Array
     /// Utf8Array: caches the string values
-    GlobalFinished(PlHashMap<u32, u32>, Utf8Array<i64>, u128),
+    GlobalFinished(PlHashMap<u32, u32>, Utf8Array<i64>, u32),
     /// Utf8Array: caches the string values
     Local(MutableUtf8Array<i64>),
 }
@@ -50,7 +50,7 @@ impl RevMappingBuilder {
 pub enum RevMapping {
     /// Hashmap: maps the indexes from the global cache/categorical array to indexes in the local Utf8Array
     /// Utf8Array: caches the string values
-    Global(PlHashMap<u32, u32>, Utf8Array<i64>, u128),
+    Global(PlHashMap<u32, u32>, Utf8Array<i64>, u32),
     /// Utf8Array: caches the string values
     Local(Utf8Array<i64>),
 }

crates/polars-core/src/chunked_array/logical/categorical/merge.rs

@@ -38,7 +38,7 @@ struct State {
 
 #[derive(Default)]
 pub(crate) struct RevMapMerger {
-    id: u128,
+    id: u32,
     original: Arc<RevMapping>,
     // only initiate state when
     // we encounter a rev-map from a different source,

crates/polars-core/src/chunked_array/logical/categorical/stringcache.rs

@@ -1,7 +1,6 @@
 use std::hash::{Hash, Hasher};
 use std::sync::atomic::{AtomicU32, Ordering};
 use std::sync::{RwLock, RwLockReadGuard, RwLockWriteGuard};
-use std::time::{SystemTime, UNIX_EPOCH};
 
 use ahash::RandomState;
 use hashbrown::hash_map::RawEntryMut;
@@ -16,6 +15,7 @@ use crate::prelude::InitHashMaps;
 /// to determine how many threads use the string cache
 /// if the refcount is zero, we may clear the string cache.
 pub(crate) static USE_STRING_CACHE: AtomicU32 = AtomicU32::new(0);
+static STRING_CACHE_UUID_CTR: AtomicU32 = AtomicU32::new(0);
 
 /// RAII for the string cache
 /// If an operation creates categoricals and uses them in a join
@@ -110,7 +110,7 @@ impl Hash for Key {
 
 pub(crate) struct SCacheInner {
     map: PlIdHashMap<Key, ()>,
-    pub(crate) uuid: u128,
+    pub(crate) uuid: u32,
     payloads: Vec<StrHashGlobal>,
 }
 
@@ -180,16 +180,7 @@ impl Default for SCacheInner {
     fn default() -> Self {
         Self {
             map: PlIdHashMap::with_capacity(HASHMAP_INIT_SIZE),
-            #[cfg(not(target_family = "wasm"))]
-            uuid: SystemTime::now()
-                .duration_since(UNIX_EPOCH)
-                .unwrap()
-                .as_nanos(),
-            #[cfg(target_family = "wasm")]
-            uuid: wasm_timer::SystemTime::now()
-                .duration_since(wasm_timer::UNIX_EPOCH)
-                .unwrap()
-                .as_nanos(),
+            uuid: STRING_CACHE_UUID_CTR.fetch_add(1, Ordering::AcqRel),
             payloads: Vec::with_capacity(HASHMAP_INIT_SIZE),
         }
     }