ibis::category Class Reference
A specialized low-cardinality text field. More...
#include <category.h>
Inheritance diagram for ibis::category:
Public Member Functions | |
| virtual long | append (const char *dt, const char *df, const uint32_t nold, const uint32_t nnew, const uint32_t nbuf, char *buf) |
| Append the content in df to the directory dt. | |
| category (const part *tbl, const char *name, const char *value, const char *dir=0, uint32_t nevt=0) | |
| category (const ibis::column &col) | |
| Copy constructor. Copy from a collumn object with KEY type. | |
| category (const part *tbl, const char *name) | |
| category (const part *tbl, FILE *file) | |
| virtual double | estimateCost (const ibis::qDiscreteRange &cmp) const |
| virtual double | estimateCost (const ibis::qContinuousRange &cmp) const |
| Estimate the cost of evaluate the query expression. | |
| virtual double | estimateCost (const ibis::qMultiString &cmp) const |
| virtual double | estimateCost (const ibis::qString &cmp) const |
| virtual const char * | getKey (uint32_t i) const |
| Return the ith value in the dictionary. | |
| virtual void | getString (uint32_t i, std::string &val) const |
Return the string value for the ith row. | |
| virtual const char * | isKey (const char *str) const |
| Is the given string one of the keys in the dictionary? Return a null pointer if not. | |
| virtual void | print (std::ostream &out) const |
| virtual long | search (const std::vector< std::string > &vals) const |
| Estimate the total number of matches for a list of strings. | |
| virtual long | search (const char *str) const |
| Estimate the number of matches. | |
| virtual long | search (const std::vector< std::string > &vals, ibis::bitvector &hits) const |
| Match a list of strings. | |
| virtual long | search (const char *str, ibis::bitvector &hits) const |
| Match a particular string. | |
| virtual array_t< uint32_t > * | selectUInts (const bitvector &mask) const |
| Return the integer values of the records marked 1 in the mask. | |
| virtual void | write (FILE *file) const |
| Write the current content to the TDC file. | |
Detailed Description
A specialized low-cardinality text field.It is also known as control values, or categorical values. This implementation directly converts string values into bitvectors (as ibis::relic), and does not store integer version of the string.
- Note:
- Value zero (0) is reserved for NULL values.
Member Function Documentation
| virtual void ibis::category::getString | ( | uint32_t | i, | |
| std::string & | val | |||
| ) | const [inline, virtual] |
Return the string value for the ith row.
Only valid for ibis::text and ibis::category. ibis::text
Reimplemented from ibis::text.
| virtual const char* ibis::category::isKey | ( | const char * | str | ) | const [inline, virtual] |
Is the given string one of the keys in the dictionary? Return a null pointer if not.
References ibis::dictionary::find().
The documentation for this class was generated from the following files:
- category.h
- category.cpp
