Functions to support the LIKE and ILIKE operator in SQL. Only single-byte character set is supported for now. More...

#include "../Shared/funcannotations.h"
#include <cstdint>

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Functions
RUNTIME_EXPORT DEVICE bool	string_like (const char str, int str_len, const char pattern, int pat_len, char escape_char)

RUNTIME_EXPORT DEVICE bool	string_ilike (const char str, int str_len, const char pattern, int pat_len, char escape_char)

RUNTIME_EXPORT DEVICE bool	string_like_simple (const char str, const int32_t str_len, const char pattern, const int32_t pat_len, char escape_char)

RUNTIME_EXPORT DEVICE bool	string_ilike_simple (const char str, const int32_t str_len, const char pattern, const int32_t pat_len, char escape_char)

RUNTIME_EXPORT DEVICE bool	string_lt (const char lhs, const int32_t lhs_len, const char rhs, const int32_t rhs_len)

RUNTIME_EXPORT DEVICE bool	string_le (const char lhs, const int32_t lhs_len, const char rhs, const int32_t rhs_len)

RUNTIME_EXPORT DEVICE bool	string_eq (const char lhs, const int32_t lhs_len, const char rhs, const int32_t rhs_len)

RUNTIME_EXPORT DEVICE bool	string_ne (const char lhs, const int32_t lhs_len, const char rhs, const int32_t rhs_len)

RUNTIME_EXPORT DEVICE bool	string_ge (const char lhs, const int32_t lhs_len, const char rhs, const int32_t rhs_len)

RUNTIME_EXPORT DEVICE bool	string_gt (const char lhs, const int32_t lhs_len, const char rhs, const int32_t rhs_len)

RUNTIME_EXPORT DEVICE int32_t	StringCompare (const char s1, const int32_t s1_len, const char s2, const int32_t s2_len)

Detailed Description

Functions to support the LIKE and ILIKE operator in SQL. Only single-byte character set is supported for now.

Definition in file StringLike.h.

Function Documentation

RUNTIME_EXPORT DEVICE bool string_eq	(	const char *	lhs,
		const int32_t	lhs_len,
		const char *	rhs,
		const int32_t	rhs_len
	)

Definition at line 336 of file StringLike.cpp.

References StringCompare().

Referenced by StringDictionary::getCompare().

                                                                        {
   return StringCompare(lhs, lhs_len, rhs, rhs_len) == 0;
 }

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RUNTIME_EXPORT DEVICE bool string_ge	(	const char *	lhs,
		const int32_t	lhs_len,
		const char *	rhs,
		const int32_t	rhs_len
	)

Definition at line 329 of file StringLike.cpp.

References StringCompare().

                                                                        {
   return StringCompare(lhs, lhs_len, rhs, rhs_len) >= 0;
 }

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RUNTIME_EXPORT DEVICE bool string_gt	(	const char *	lhs,
		const int32_t	lhs_len,
		const char *	rhs,
		const int32_t	rhs_len
	)

Definition at line 322 of file StringLike.cpp.

References StringCompare().

                                                                        {
   return StringCompare(lhs, lhs_len, rhs, rhs_len) > 0;
 }

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RUNTIME_EXPORT DEVICE bool string_ilike	(	const char *	str,
		int	str_len,
		const char *	pattern,
		int	pat_len,
		char	escape_char
	)

RUNTIME_EXPORT DEVICE bool string_ilike_simple	(	const char *	str,
		const int32_t	str_len,
		const char *	pattern,
		const int32_t	pat_len,
		char	escape_char
	)

Definition at line 61 of file StringLike.cpp.

References lowercase().

Referenced by StringDictionaryProxy::getLike(), and StringDictionary::getLikeImpl().

                                                                             {
   int i, j;
   int search_len = str_len - pat_len + 1;
   for (i = 0; i < search_len; ++i) {
     for (j = 0; j < pat_len && pattern[j] == lowercase(str[j + i]); ++j) {
     }
     if (j >= pat_len) {
       return true;
     }
   }
   return false;
 }

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RUNTIME_EXPORT DEVICE bool string_le	(	const char *	lhs,
		const int32_t	lhs_len,
		const char *	rhs,
		const int32_t	rhs_len
	)

Definition at line 315 of file StringLike.cpp.

References StringCompare().

                                                                        {
   return StringCompare(lhs, lhs_len, rhs, rhs_len) <= 0;
 }

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RUNTIME_EXPORT DEVICE bool string_like	(	const char *	str,
		int	str_len,
		const char *	pattern,
		int	pat_len,
		char	escape_char
	)

RUNTIME_EXPORT DEVICE bool string_like_simple	(	const char *	str,
		const int32_t	str_len,
		const char *	pattern,
		const int32_t	pat_len,
		char	escape_char
	)

Definition at line 43 of file StringLike.cpp.

Referenced by StringDictionaryProxy::getLike(), and StringDictionary::getLikeImpl().

                                                                            {
   int i, j;
   int search_len = str_len - pat_len + 1;
   for (i = 0; i < search_len; ++i) {
     for (j = 0; j < pat_len && pattern[j] == str[j + i]; ++j) {
     }
     if (j >= pat_len) {
       return true;
     }
   }
   return false;
 }

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RUNTIME_EXPORT DEVICE bool string_lt	(	const char *	lhs,
		const int32_t	lhs_len,
		const char *	rhs,
		const int32_t	rhs_len
	)

Definition at line 308 of file StringLike.cpp.

References StringCompare().

Referenced by StringDictionary::getCompare(), StringDictionary::mergeSortedCache(), and StringDictionary::sortCache().

                                                                        {
   return StringCompare(lhs, lhs_len, rhs, rhs_len) < 0;
 }

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RUNTIME_EXPORT DEVICE bool string_ne	(	const char *	lhs,
		const int32_t	lhs_len,
		const char *	rhs,
		const int32_t	rhs_len
	)

Definition at line 343 of file StringLike.cpp.

References StringCompare().

                                                                        {
   return StringCompare(lhs, lhs_len, rhs, rhs_len) != 0;
 }

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RUNTIME_EXPORT DEVICE int32_t StringCompare	(	const char *	s1,
		const int32_t	s1_len,
		const char *	s2,
		const int32_t	s2_len
	)

Definition at line 272 of file StringLike.cpp.

Referenced by string_eq(), string_ge(), string_gt(), string_le(), string_lt(), and string_ne().

                                                                              {
   const char* s1_ = s1;
   const char* s2_ = s2;
 
   while (s1_ < s1 + s1_len && s2_ < s2 + s2_len && *s1_ == *s2_) {
     s1_++;
     s2_++;
   }
 
   unsigned char c1 = (s1_ < s1 + s1_len) ? (*(unsigned char*)s1_) : 0;
   unsigned char c2 = (s2_ < s2 + s2_len) ? (*(unsigned char*)s2_) : 0;
 
   return c1 - c2;
 }

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