Package io.deephaven.engine.table.impl.select

Interface FormulaColumn

All Superinterfaces:

Selectable, SelectColumn

All Known Implementing Classes:

AbstractFormulaColumn, DhFormulaColumn, FormulaColumnPython

public interface FormulaColumn
extends SelectColumn

Nested Class Summary

Nested classes/interfaces inherited from interface io.deephaven.engine.table.impl.select.SelectColumn

SelectColumn.ExpressionAdapter

Field Summary

Fields inherited from interface io.deephaven.engine.table.impl.select.SelectColumn

ZERO_LENGTH_SELECT_COLUMN_ARRAY

Method Summary

Modifier and Type	Method	Description
static FormulaColumn	createFormulaColumn(String columnName, String formulaString)
static FormulaColumn	createFormulaColumn(String columnName, String formulaString, FormulaParserConfiguration parser)
default Pair<String,Map<Long,List<MatchPair>>>	getFormulaShiftColPair()	Returns a Pair object consisting of formula string and shift to column MatchPairs.
default boolean	hasConstantArrayAccess()	Returns true if the formula expression of the column has Array Access that conforms to "i +/- <constant>" or "ii +/- <constant>".
default boolean	hasConstantValue()

Methods inherited from interface io.deephaven.engine.table.impl.select.SelectColumn

copy, expression, getColumnArrays, getColumns, getDataView, getLazyView, getMatchPair, getName, getReturnedComponentType, getReturnedType, initDef, initDef, initInputs, isRetain, isStateless, newColumn, newDestInstance, newFlatDestInstance, validateSafeForRefresh

Method Details

createFormulaColumn

static FormulaColumn createFormulaColumn(String columnName,
 String formulaString,
 FormulaParserConfiguration parser)

createFormulaColumn

static FormulaColumn createFormulaColumn(String columnName,
 String formulaString)

hasConstantValue

default boolean hasConstantValue()

Returns:

true if all rows have a single constant value

hasConstantArrayAccess

default boolean hasConstantArrayAccess()

Returns true if the formula expression of the column has Array Access that conforms to "i +/- <constant>" or "ii +/- <constant>".

Returns:

true or false

getFormulaShiftColPair

default Pair<String,Map<Long,List<MatchPair>>> getFormulaShiftColPair()

Returns a Pair object consisting of formula string and shift to column MatchPairs. If the column formula or expression has Array Access that conforms to "i +/- <constant>" or "ii +/- <constant>". If there is a parsing error for the expression null is returned.

Returns:

Pair of final formula string and shift to column MatchPairs.