compute

func And ¶

func And(alloc *memory.Allocator, left, right columnar.Datum, selection memory.Bitmap) (columnar.Datum, error)

And computes the logical AND of two input boolean datums. And returns an error if the input kind of either datum is not a boolean. If both input datums are arrays, they must be of the same length.

Special cases:

• If either side of the AND is null, the result is null.

func Equals ¶

func Equals(alloc *memory.Allocator, left, right columnar.Datum, selection memory.Bitmap) (columnar.Datum, error)

Equals compares the two input datum. Equals returns an error if the input kinds are not identical, or if the datum types are not considered comparable.

Special cases:

• If a null is found on either side, the result is null.

func GreaterOrEqual ¶

func GreaterOrEqual(alloc *memory.Allocator, left, right columnar.Datum, selection memory.Bitmap) (columnar.Datum, error)

GreaterOrEqual compares the two input datum for greater-than-or-equal ordering. GreaterOrEqual returns an error if the input kinds are not identical, or if the datum types are not ordered.

Special cases:

• If a null is found on either side, the result is null.

func GreaterThan ¶

func GreaterThan(alloc *memory.Allocator, left, right columnar.Datum, selection memory.Bitmap) (columnar.Datum, error)

GreaterThan compares the two input datum for greater-than ordering. GreaterThan returns an error if the input kinds are not identical, or if the datum types are not ordered.

Special cases:

• If a null is found on either side, the result is null.

func IsMember ¶

func IsMember(alloc *memory.Allocator, datum columnar.Datum, values *columnar.Set, selection memory.Bitmap) (columnar.Datum, error)

IsMember checks if each item in datum is a member of the values set. The selection parameter controls which rows are evaluated:

• If selection.Len(), all rows are evaluated
• Otherwise, only rows where selection bit is true are evaluated, non-selected rows result in null

func LessOrEqual ¶

func LessOrEqual(alloc *memory.Allocator, left, right columnar.Datum, selection memory.Bitmap) (columnar.Datum, error)

LessOrEqual compares the two input datum for less-than-or-equal ordering. LessOrEqual returns an error if the input kinds are not identical, or if the datum types are not ordered.

Special cases:

• If a null is found on either side, the result is null.

func LessThan ¶

func LessThan(alloc *memory.Allocator, left, right columnar.Datum, selection memory.Bitmap) (columnar.Datum, error)

LessThan compares the two input datum for less-than ordering. LessThan returns an error if the input kinds are not identical, or if the datum types are not ordered.

Special cases:

• If a null is found on either side, the result is null.

func Not ¶

func Not(alloc *memory.Allocator, input columnar.Datum, selection memory.Bitmap) (columnar.Datum, error)

Not negates the input boolean datum. Not returns an error if the input kind is not a boolean.

Special cases:

• The negation of null is null.

func NotEquals ¶

func NotEquals(alloc *memory.Allocator, left, right columnar.Datum, selection memory.Bitmap) (columnar.Datum, error)

NotEquals compares the two input datum for inequality. NotEquals returns an error if the input kinds are not identical, or if the datum types are not considered comparable.

Special cases:

• If a null is found on either side, the result is null.

func Or ¶

func Or(alloc *memory.Allocator, left, right columnar.Datum, selection memory.Bitmap) (columnar.Datum, error)

Or computes the logical OR of two input boolean datums. Or returns an error if the input kind of either datum is not a boolean. If both input datums are arrays, they must be of the same length.

Special cases:

• If either side of the OR is null, the result is null.

func RegexpMatch ¶

func RegexpMatch(alloc *memory.Allocator, haystack columnar.Datum, regexp *regexp.Regexp, selection memory.Bitmap) (columnar.Datum, error)

RegexpMatch computes the regular expression match against a datum. It returns a boolean datum indicating whether the regular expression matched the haystack datum.

Special cases:

• If a value in the haystack is null, the result for that value is null.
• If the regexp is null, the result is null.

func Substr ¶

func Substr(alloc *memory.Allocator, haystack columnar.Datum, needle columnar.Datum, selection memory.Bitmap) (columnar.Datum, error)

Substr computes the case sensitive match of a needle datum against haystack datum It returns a boolean datum indicating whether the needle was found in the haystack.

Special cases:

• If a value in the haystack is null, the result for that value is null.
• If the needle is null, the result is null.

func SubstrInsensitive ¶

func SubstrInsensitive(alloc *memory.Allocator, haystack columnar.Datum, needle columnar.Datum, selection memory.Bitmap) (columnar.Datum, error)

SubstrInsensitive computes the case insensitive match of a needle datum against haystack datum It returns a boolean datum indicating whether the needle was found in the haystack.

Special cases:

• If a value in the haystack is null, the result for that value is null.
• If the needle is null, the result is null.