beliefer commented on code in PR #41561:
URL: https://github.com/apache/spark/pull/41561#discussion_r1233271566
##########
sql/core/src/main/scala/org/apache/spark/sql/functions.scala:
##########
@@ -4075,6 +4075,210 @@ object functions {
StartsWith(str.expr, prefix.expr)
}
+ /**
+ * Returns the ASCII character having the binary equivalent to `n`.
+ * If n is larger than 256 the result is equivalent to char(n % 256)
+ *
+ * @group string_funcs
+ * @since 3.5.0
+ */
+ def char(n: Column): Column = withExpr {
+ Chr(n.expr)
+ }
+
+ /**
+ * Removes the leading and trailing space characters from `str`.
+ *
+ * @group string_funcs
+ * @since 3.5.0
+ */
+ def btrim(str: Column): Column = withExpr {
+ new StringTrimBoth(str.expr)
+ }
+
+ /**
+ * Remove the leading and trailing `trim` characters from `str`.
+ *
+ * @group string_funcs
+ * @since 3.5.0
+ */
+ def btrim(str: Column, trim: Column): Column = withExpr {
+ new StringTrimBoth(str.expr, trim.expr)
+ }
+
+ /**
+ * Returns the character length of string data or number of bytes of binary
data.
+ * The length of string data includes the trailing spaces.
+ * The length of binary data includes binary zeros.
+ *
+ * @group string_funcs
+ * @since 3.5.0
+ */
+ def char_length(str: Column): Column = withExpr {
+ Length(str.expr)
+ }
+
+ /**
+ * Returns the character length of string data or number of bytes of binary
data.
+ * The length of string data includes the trailing spaces.
+ * The length of binary data includes binary zeros.
+ *
+ * @group string_funcs
+ * @since 3.5.0
+ */
+ def character_length(str: Column): Column = withExpr {
+ Length(str.expr)
+ }
+
+ /**
+ * Returns the ASCII character having the binary equivalent to `n`.
+ * If n is larger than 256 the result is equivalent to chr(n % 256)
+ *
+ * @group string_funcs
+ * @since 3.5.0
+ */
+ def chr(n: Column): Column = withExpr {
+ Chr(n.expr)
+ }
+
+ /**
+ * Returns a boolean. The value is True if right is found inside left.
+ * Returns NULL if either input expression is NULL. Otherwise, returns False.
+ * Both left or right must be of STRING type.
+ *
+ * @note
+ * Only STRING type is supported in this function, while `contains` in SQL
supports both
+ * STRING and BINARY.
+ *
+ * @group string_funcs
+ * @since 3.5.0
+ */
+ def contains(left: Column, right: Column): Column = withExpr {
+ Contains(left.expr, right.expr)
+ }
+
+ /**
+ * Returns the `n`-th input, e.g., returns `input2` when `n` is 2.
+ * The function returns NULL if the index exceeds the length of the array
+ * and `spark.sql.ansi.enabled` is set to false. If `spark.sql.ansi.enabled`
is set to true,
+ * it throws ArrayIndexOutOfBoundsException for invalid indices.
+ *
+ * @group string_funcs
+ * @since 3.5.0
+ */
+ @scala.annotation.varargs
+ def elt(inputs: Column*): Column = withExpr {
+ Elt(inputs.map(_.expr))
+ }
+
+ /**
+ * Returns the index (1-based) of the given string (`str`) in the
comma-delimited
+ * list (`strArray`). Returns 0, if the string was not found or if the given
string (`str`)
+ * contains a comma.
+ *
+ * @group string_funcs
+ * @since 3.5.0
+ */
+ def find_in_set(str: Column, strArray: Column): Column = withExpr {
+ FindInSet(str.expr, strArray.expr)
+ }
+
+ /**
+ * Returns true if str matches `pattern` with `escapeChar`, null if any
arguments are null,
+ * false otherwise.
+ *
+ * @group string_funcs
+ * @since 3.5.0
+ */
+ def like(str: Column, pattern: Column, escapeChar: Column): Column =
withExpr {
+ escapeChar.expr match {
+ case escape @ Literal(_, StringType) =>
+ Like(str.expr, pattern.expr, escape.eval().toString.charAt(0))
Review Comment:
```suggestion
case StringLiteral(v) if v.size == 1 =>
Like(str.expr, pattern.expr, v.charAt(0))
```
##########
core/src/main/resources/error/error-classes.json:
##########
@@ -395,6 +395,11 @@
"Input to <functionName> should all be the same type, but it's
<dataType>."
]
},
+ "ESCAPE_CHAR_WRONG_TYPE" : {
+ "message" : [
+ "EscapeChar should be a string literal."
Review Comment:
`'EscapeChar' should be a string literal of length one.`
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