mz_txn_wal

Struct TxnsCodecDefault

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pub struct TxnsCodecDefault;
Expand description

A reasonable default implementation of TxnsCodec.

This uses the “native” Codecs for ShardId and Vec<u8>, with the latter empty for TxnsEntry::Register and non-empty for TxnsEntry::Append.

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impl Debug for TxnsCodecDefault

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl TxnsCodec for TxnsCodecDefault

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type Key = ShardId

The K type used in the txns shard.
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type Val = Vec<u8>

The V type used in the txns shard.
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fn schemas() -> (<Self::Key as Codec>::Schema, <Self::Val as Codec>::Schema)

Returns the Schemas to use with Self::Key and Self::Val.
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fn encode(e: TxnsEntry) -> (Self::Key, Self::Val)

Encodes a TxnsEntry in the format persisted in the txns shard.
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fn decode(key: Self::Key, val: Self::Val) -> TxnsEntry

Decodes a TxnsEntry from the format persisted in the txns shard. Read more
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fn should_fetch_part(data_id: &ShardId, stats: &PartStats) -> Option<bool>

Returns if a part might include the given data shard based on pushdown stats. Read more

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