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Add comment for used_flags in hash join, fix build
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01a6e01ad7
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@ -87,6 +87,9 @@ public:
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bool isInserted() const { return inserted; }
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};
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/// FindResult optionally may contain pointer to value and offset in hashtable buffer.
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/// Only bool found is required.
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/// So we will have 4 different specializations for FindResultImpl
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class FindResultImplBase
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{
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bool found;
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@ -241,6 +244,8 @@ protected:
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{
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if constexpr (Cache::consecutive_keys_optimization)
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{
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/// It's possible to support such combination, but code will became more complex.
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/// Now there's not place where we need this options enabled together
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static_assert(!FindResult::has_offset, "`consecutive_keys_optimization` and `has_offset` are conflicting options");
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if (cache.check(key))
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{
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@ -476,6 +476,10 @@ public:
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size_t getBufferSizeInCells() const { return NUM_CELLS; }
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/// Return offset for result in internal buffer.
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/// Result can have value up to `getBufferSizeInCells() + 1`
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/// because offset for zero value considered to be 0
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/// and for other values it will be `offset in buffer + 1`
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size_t offsetInternal(ConstLookupResult ptr) const
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{
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if (ptr->isZero(*this))
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@ -1214,6 +1214,10 @@ public:
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return grower.bufSize();
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}
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/// Return offset for result in internal buffer.
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/// Result can have value up to `getBufferSizeInCells() + 1`
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/// because offset for zero value considered to be 0
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/// and for other values it will be `offset in buffer + 1`
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size_t offsetInternal(ConstLookupResult ptr) const
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{
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if (ptr->isZero(*this))
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@ -57,6 +57,7 @@ struct NotProcessedCrossJoin : public ExtraBlock
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namespace JoinStuff
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{
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/// Version of `getUsed` with dynamic dispatch
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bool JoinUsedFlags::getUsedSafe(size_t i) const
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{
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if (flags.empty())
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@ -576,6 +577,7 @@ namespace
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APPLY_FOR_JOIN_VARIANTS(M)
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#undef M
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}
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__builtin_unreachable();
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}
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}
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@ -350,6 +350,9 @@ private:
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/// Right table data. StorageJoin shares it between many Join objects.
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std::shared_ptr<RightTableData> data;
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/// Flags that indicate that particular row already used in join.
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/// Flag is stored for every record in hash map.
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/// Number of this flags equals to hashtable buffer size (plus one for zero value).
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mutable JoinStuff::JoinUsedFlags used_flags;
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Sizes key_sizes;
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