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changes.mady.by.user Rudrangi Anupriya

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changes.mady.by.user Lee Anjella Macabuhay

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we would like to bring support for contains operator in cps-path. 

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Native query for Contains Operator  using Like Keyword :

{  "lang": "en",   "price": 699,   "title": "The Golden Compass",   "authors": [            "Philip Pullman"  ],  "pub_year":1995 }                                                                                                 {  "lang": "English",   "price": 895,   "title": "Feersum Endjinn",   "authors": [             "Iain M. Banks"  ],  "pub_year":1994 }   Which keyword to use ? Do we want case sensitivity or not? Do we follow the Xpath contains or do we become specific?
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Issue

Notes

Decisions
1

cpsdb=# SELECT * FROM FRAGMENT WHERE anchor_id = 4 and attributes->>'lang' ilike '%En%';

Query Response :

Code Block
titleJson Response
collapsetrue
  • like %en% 
  • ilike %En% 
  • like 'en' 


  As per discussion , with Toine Siebelink  Prefers Contains Xpath is case sensitive , So ilike keyword would be suitable to implement the contains query which support case sensitive attribute values.

Need to discuss with stakeholders.

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2.Using SIMILAR TO Regular Expression Keyword :

The only difference between like and similar to is to pattern matches the given string. It is similar to LIKE, except that it interprets the pattern using the SQL standard's definition of a regular expression

SIMILAR TO supports these pattern-matching metacharacters borrowed from POSIX regular expressions:

  • | denotes alternation (either of two alternatives).

  • * denotes repetition of the previous item zero or more times.

  • + denotes repetition of the previous item one or more times.

  • ? denotes repetition of the previous item zero or one time.

  • {m} denotes repetition of the previous item exactly m times.

  • {m,} denotes repetition of the previous item m or more times.

  • {m,n} denotes repetition of the previous item at least m and not more than n times.

  • Parentheses () can be used to group items into a single logical item.

  • A bracket expression [...] specifies a character class, just as in POSIX regular expressions.

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