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feat: add string trimming and padding functions #248

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merged 7 commits into from
Jul 28, 2022
+158 −3
Merged

feat: add string trimming and padding functions #248

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f510b7d
feat: add string trimming and padding functions
richtia Jul 15, 2022
3bfdb96
refactor: add names and descriptions for args
richtia Jul 18, 2022
2b0e096
refactor: remove promotions and function definitions for fixedchar
richtia Jul 21, 2022
2ab528d
Merge branch 'main' into string_trimming_padding
richtia Jul 26, 2022
cf41bdf
refactor: update arg lengths
richtia Jul 26, 2022
bdcba3e
refactor: update descriptions for lpad and rpad
richtia Jul 27, 2022
0b47bd5
refactor: remove center function
richtia Jul 28, 2022
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161 changes: 158 additions & 3 deletions extensions/functions_string.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -27,7 +27,9 @@ scalar_functions:
return: "BOOLEAN"
-
name: substring
description: Extract a portion of a string from another string.
description: >-
Extract a substring of a specified length starting from position start.
A start value of 1 refers to the first characters of the string.
impls:
- args:
- value: "varchar<L1>"
Expand All @@ -44,7 +46,7 @@ scalar_functions:
- value: i32
- value: i32
return: "string"
-
-
name: starts_with
description: Whether this string starts with another string.
impls:
Expand Down Expand Up @@ -222,7 +224,8 @@ scalar_functions:
name: "substring"
description: The substring to count.
return: i64
- name: replace
-
name: replace
description: >-
Replace all occurrences of the substring with the replacement string.
impls:
Expand All @@ -248,3 +251,155 @@ scalar_functions:
name: "replacement"
description: The replacement string.
return: "varchar<L1>"
-
name: ltrim
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With these trimming functions where the user can specify characters to remove, is there anything to clarify whether the characters are interpreted as-is or as a regex?

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My assumption was as-is, since that seems to be how Postgresql and DuckDB do it. For regex, they use different functions. I was planning on looking into those functions in another PR.

description: >-
Remove any occurrence of the characters from the left side of the string.
If no characters are specified, spaces are removed.
impls:
- args:
- value: "varchar<L1>"
name: "input"
description: "The string to remove characters from."
- value: "varchar<L2>"
name: "characters"
description: "The set of characters to remove."
return: "varchar<L1>"
- args:
- value: "string"
name: "input"
description: "The string to remove characters from."
- value: "string"
name: "characters"
description: "The set of characters to remove."
return: "string"
-
name: rtrim
description: >-
Remove any occurrence of the characters from the right side of the string.
If no characters are specified, spaces are removed.
impls:
- args:
- value: "varchar<L1>"
name: "input"
description: "The string to remove characters from."
- value: "varchar<L2>"
name: "characters"
description: "The set of characters to remove."
return: "varchar<L1>"
- args:
- value: "string"
name: "input"
description: "The string to remove characters from."
- value: "string"
name: "characters"
description: "The set of characters to remove."
return: "string"
-
name: trim
description: >-
Remove any occurrence of the characters from the left and right sides of
the string. If no characters are specified, spaces are removed.
impls:
- args:
- value: "varchar<L1>"
name: "input"
description: "The string to remove characters from."
- value: "varchar<L2>"
name: "characters"
description: "The set of characters to remove."
return: "varchar<L1>"
- args:
- value: "string"
name: "input"
description: "The string to remove characters from."
- value: "string"
name: "characters"
description: "The set of characters to remove."
return: "string"
-
name: lpad
description: >-
Left-pad the input string with the string of 'characters' until the specified length of the
string has been reached. If the input string is longer than 'length', remove characters from
the right-side to shorten it to 'length' characters. If the string of 'characters' is longer
than the remaining 'length' needed to be filled, only pad until 'length' has been reached.
If 'characters' is not specified, the default value is a single space.
impls:
- args:
- value: "varchar<L1>"
name: "input"
description: "The string to pad."
- value: i32
name: "length"
description: "The length of the output string."
- value: "varchar<L2>"
name: "characters"
description: "The string of characters to use for padding."
return: "varchar<L1>"
- args:
- value: "string"
name: "input"
description: "The string to pad."
- value: i32
name: "length"
description: "The length of the output string."
- value: "string"
name: "characters"
description: "The string of characters to use for padding."
return: "string"
-
name: rpad
description: >-
Right-pad the input string with the string of 'characters' until the specified length of the
string has been reached. If the input string is longer than 'length', remove characters from
the left-side to shorten it to 'length' characters. If the string of 'characters' is longer
than the remaining 'length' needed to be filled, only pad until 'length' has been reached.
If 'characters' is not specified, the default value is a single space.
impls:
- args:
- value: "varchar<L1>"
name: "input"
description: "The string to pad."
- value: i32
name: "length"
description: "The length of the output string."
- value: "varchar<L2>"
name: "characters"
description: "The string of characters to use for padding."
return: "varchar<L1>"
- args:
- value: "string"
name: "input"
description: "The string to pad."
- value: i32
name: "length"
description: "The length of the output string."
- value: "string"
name: "characters"
description: "The string of characters to use for padding."
return: "string"
-
name: left
description: Extract count characters starting from the left of the string.
impls:
- args:
- value: "varchar<L1>"
- value: i32
return: "varchar<L1>"
- args:
- value: "string"
- value: i32
return: "string"
-
name: right
description: Extract count characters starting from the right of the string.
impls:
- args:
- value: "varchar<L1>"
- value: i32
return: "varchar<L1>"
- args:
- value: "string"
- value: i32
return: "string"