duckdb::ColumnScanState Struct Reference

Collaboration diagram for duckdb::ColumnScanState:

Public Member Functions
	ColumnScanState (optional_ptr< CollectionScanState > parent_p)
void	PushDownCast (const LogicalType &original_type, const LogicalType &cast_type)
void	Initialize (const QueryContext &context_p, const LogicalType &type, const StorageIndex &column_id, optional_ptr< TableScanOptions > options)
void	Initialize (const QueryContext &context_p, const LogicalType &type, optional_ptr< TableScanOptions > options)
void	Next (idx_t count)
	Move the scan state forward by "count" rows (including all child states)
void	NextInternal (idx_t count)
	Move ONLY this state forward by "count" rows (i.e. not the child states)
idx_t	GetPositionInSegment () const
	Returns the current row position in the segment.

Public Attributes
optional_ptr< CollectionScanState >	parent
QueryContext	context
	The query context for this scan.
optional_ptr< SegmentNode< ColumnSegment > >	current
	The column segment that is currently being scanned.
ColumnSegmentTree *	segment_tree = nullptr
	Column segment tree.
idx_t	offset_in_column = 0
	The current row offset in the column.
idx_t	internal_index = 0
	The internal row index (i.e. the position of the SegmentScanState)
StorageIndex	storage_index
	Storage index of the current column that's being scanned.
unique_ptr< SegmentScanState >	scan_state
	Segment scan state.
unsafe_vector< ColumnScanState >	child_states
	Child states of the vector.
bool	initialized = false
	Whether or not InitializeState has been called for this segment.
bool	segment_checked = false
	If this segment has already been checked for skipping purposes.
vector< unique_ptr< SegmentScanState > >	previous_states
idx_t	last_offset = 0
	The last read offset in the child state (used for LIST columns only)
vector< bool >	scan_child_column
	Whether or not we should scan a specific child column.
optional_ptr< TableScanOptions >	scan_options
	Contains TableScan level config for scanning.
unique_ptr< PushedDownExpressionState >	expression_state
	(optionally) the expression state for any pushed down expression(s)
UpdateScanType	update_scan_type = UpdateScanType::STANDARD
	Whether or not updates should be allowed.

Constructor & Destructor Documentation

ColumnScanState()

duckdb::ColumnScanState::ColumnScanState ( optional_ptr< CollectionScanState >  parent_p )

inlineexplicit

                                                                         : parent(parent_p) {
    }

Member Data Documentation

previous_states

vector<unique_ptr<SegmentScanState> > duckdb::ColumnScanState::previous_states

We initialize one SegmentScanState per segment, however, if scanning a DataChunk requires us to scan over more than one Segment, we need to keep the scan states of the previous segments around

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The documentation for this struct was generated from the following file:

• external/duckdb/duckdb.cpp