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[SPARK-27931][SQL] Accept "true", "yes", "1", "false", "no", "0", and unique prefixes as input and trim input for the boolean data type. #25458

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[SPARK-27931][SQL] Accept "true", "yes", "1", "false", "no", "0", and unique prefixes as input and trim input for the boolean data type. #25458

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7d61642
[SPARK-27931][SQL] Accept 'on' and 'off' as input and trim input for …
Aug 15, 2019
933fe86
[SPARK-27931][SQL] Unique prefixes of strings are also accepted for t…
Aug 16, 2019
a5aec9f
Trim string whitespace so it should be true
Aug 16, 2019
9e9aac3
Generated spark golden files.
Aug 16, 2019
dacd46b
add a comment: "true", "yes", "1", "false", "no", "0", and unique pre…
Aug 27, 2019
abe9a84
[SPARK-27931][SQL] add a "FAlse" test case and remove the redundant s…
Aug 30, 2019
2ea551c
[SPARK-27931][SQL] add a negative test case for "o"
Aug 30, 2019
b787483
removed "[SPARK-27931] Trim the string when cast string type to boole…
Aug 30, 2019
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11 changes: 7 additions & 4 deletions sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/StringUtils.scala
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Expand Up @@ -65,12 +65,15 @@ object StringUtils extends Logging {
"(?s)" + out.result() // (?s) enables dotall mode, causing "." to match new lines
}

private[this] val trueStrings = Set("t", "true", "y", "yes", "1").map(UTF8String.fromString)
private[this] val falseStrings = Set("f", "false", "n", "no", "0").map(UTF8String.fromString)
private[this] val trueStrings =
Set("true", "tru", "tr", "t", "yes", "ye", "y", "on", "1").map(UTF8String.fromString)

private[this] val falseStrings =
Set("false", "fals", "fal", "fa", "f", "no", "n", "off", "of", "0").map(UTF8String.fromString)

// scalastyle:off caselocale
def isTrueString(s: UTF8String): Boolean = trueStrings.contains(s.toLowerCase)
def isFalseString(s: UTF8String): Boolean = falseStrings.contains(s.toLowerCase)
def isTrueString(s: UTF8String): Boolean = trueStrings.contains(s.toLowerCase.trim())
def isFalseString(s: UTF8String): Boolean = falseStrings.contains(s.toLowerCase.trim())
// scalastyle:on caselocale

/**
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23 changes: 18 additions & 5 deletions sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/CastSuite.scala
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Expand Up @@ -819,19 +819,32 @@ class CastSuite extends SparkFunSuite with ExpressionEvalHelper {
}

test("cast string to boolean") {
checkCast("t", true)

checkCast("true", true)
checkCast("tru", true)
checkCast("tr", true)
checkCast("t", true)
checkCast("tRUe", true)
checkCast("y", true)
checkCast(" tRue ", true)
checkCast(" tRu ", true)
checkCast("yes", true)
checkCast("ye", true)
checkCast("y", true)
checkCast("1", true)
checkCast("on", true)

checkCast("f", false)
checkCast("false", false)
checkCast("FAlsE", false)
checkCast("n", false)
checkCast("fals", false)
checkCast("fal", false)
checkCast("fa", false)
checkCast("f", false)
checkCast(" fAlse ", false)
checkCast(" fAls ", false)
checkCast("no", false)
checkCast("n", false)
checkCast("0", false)
checkCast("off", false)
checkCast("of", false)
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@HyukjinKwon HyukjinKwon Aug 23, 2019

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@younggyuchun, just for doubly sure, did you double check the behaviours against PostgreSQL?

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@younggyuchun younggyuchun Aug 23, 2019

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@HyukjinKwon Here it is:
image

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@cloud-fan cloud-fan Aug 28, 2019

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This is not documented: https://www.postgresql.org/docs/devel/datatype-boolean.html

Postgres may support of for history reasons, I don't think we have to follow it.

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@younggyuchun younggyuchun Aug 28, 2019

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@cloud-fan @dongjoon-hyun @HyukjinKwon
This build accepts several unique prefixes for the boolean data type. For example, tru, tr, ye, fals, fal, fa and of, which are not documented. Do we want to not to accept these prefixes?

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@dongjoon-hyun dongjoon-hyun Aug 30, 2019

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@cloud-fan . It's a documented feature in that document. We had better support it.

Unique prefixes of these strings are also accepted, for example t or n. Leading or trailing whitespace is ignored, and case does not matter.

cc @gatorsmile

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@dongjoon-hyun dongjoon-hyun Aug 30, 2019 •
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BTW, @younggyuchun . Please add a negative test case.
o is not supported because it's not unique. It's a common prefix for on and off.
It should be null.

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@HyukjinKwon HyukjinKwon Aug 30, 2019

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Seems okay to me

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@cloud-fan cloud-fan Aug 30, 2019

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SGTM


checkEvaluation(cast("abc", BooleanType), null)
checkEvaluation(cast("", BooleanType), null)
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2 changes: 1 addition & 1 deletion sql/core/src/test/resources/sql-tests/inputs/pgSQL/boolean.sql
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Expand Up @@ -23,7 +23,7 @@ SELECT false AS `false`;
SELECT boolean('t') AS true;

-- [SPARK-27931] Trim the string when cast string type to boolean type
SELECT boolean(' f ') AS `false`;
SELECT boolean(' f ') AS `true`;
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@younggyuchun younggyuchun Aug 16, 2019

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@wangyum I think it should be 'true'. Is it correct?

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@wangyum wangyum Aug 16, 2019

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It's false:
image

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@younggyuchun younggyuchun Aug 16, 2019

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Let me dig into this.


SELECT boolean('true') AS true;

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