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[SPARK-27638][SQL]: Cast string to date/timestamp in binary comparisons with dates/timestamps #24567

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[SPARK-27638][SQL]: Cast string to date/timestamp in binary comparisons with dates/timestamps #24567

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e24514e
SPARK-27638: date format yyyy-M-dd string comparison not handled prop…
May 9, 2019
41a03dd
change relative comments
May 10, 2019
19ec071
Merge branch 'master' of https://github.com/apache/spark into SPARK-2…
May 10, 2019
ac82eb2
cast to timestamp when comparting string and timestamp & enrich test…
May 12, 2019
34b00e9
add SQLConf legacy option to fallback to the old string vs date/times…
May 13, 2019
e63367c
Merge branch 'master' of https://github.com/apache/spark into SPARK-2…
May 13, 2019
c3e80f7
Modify migration guide & rename SQLConf option
May 13, 2019
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15 changes: 8 additions & 7 deletions sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
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Expand Up @@ -120,13 +120,14 @@ object TypeCoercion {
*/
private def findCommonTypeForBinaryComparison(
dt1: DataType, dt2: DataType, conf: SQLConf): Option[DataType] = (dt1, dt2) match {
// We should cast all relative timestamp/date/string comparison into string comparisons
// This behaves as a user would expect because timestamp strings sort lexicographically.
// i.e. TimeStamp(2013-01-01 00:00 ...) < "2014" = true
case (StringType, DateType) => Some(StringType)
case (DateType, StringType) => Some(StringType)
case (StringType, TimestampType) => Some(StringType)
case (TimestampType, StringType) => Some(StringType)
case (StringType, DateType)
=> if (conf.castDateTimestampToString) Some(StringType) else Some(DateType)
case (DateType, StringType)
=> if (conf.castDateTimestampToString) Some(StringType) else Some(DateType)
case (StringType, TimestampType)
=> if (conf.castDateTimestampToString) Some(StringType) else Some(TimestampType)
case (TimestampType, StringType)
=> if (conf.castDateTimestampToString) Some(StringType) else Some(TimestampType)
case (StringType, NullType) => Some(StringType)
case (NullType, StringType) => Some(StringType)

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9 changes: 9 additions & 0 deletions sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
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Expand Up @@ -1760,6 +1760,13 @@ object SQLConf {
.internal()
.intConf
.createWithDefault(Int.MaxValue)

val LEGACY_CAST_DATE_TIMESTAMP_TO_STRING =
buildConf("spark.sql.legacy.binaryComparison.castDateTimestampToString")
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spark.sql.legacy.typeCoercion.datetimeToString

.doc("If it is set to true, date/timestamp will cast to string in binary comparisons " +
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can we also add a migration guide for this behavior change and mention this config?

"with String")
.booleanConf
.createWithDefault(false)
}

/**
Expand Down Expand Up @@ -2211,6 +2218,8 @@ class SQLConf extends Serializable with Logging {
def setCommandRejectsSparkCoreConfs: Boolean =
getConf(SQLConf.SET_COMMAND_REJECTS_SPARK_CORE_CONFS)

def castDateTimestampToString: Boolean = getConf(SQLConf.LEGACY_CAST_DATE_TIMESTAMP_TO_STRING)

/** ********************** SQLConf functionality methods ************ */

/** Set Spark SQL configuration properties. */
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12 changes: 6 additions & 6 deletions sql/core/src/test/resources/sql-tests/results/predicate-functions.sql.out
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Expand Up @@ -85,7 +85,7 @@ false
-- !query 10
select to_date('2009-07-30 04:17:52') > '2009-07-30 04:17:52'
-- !query 10 schema
struct<(CAST(to_date('2009-07-30 04:17:52') AS STRING) > 2009-07-30 04:17:52):boolean>
struct<(to_date('2009-07-30 04:17:52') > CAST(2009-07-30 04:17:52 AS DATE)):boolean>
-- !query 10 output
false

Expand Down Expand Up @@ -141,9 +141,9 @@ true
-- !query 17
select to_date('2009-07-30 04:17:52') >= '2009-07-30 04:17:52'
-- !query 17 schema
struct<(CAST(to_date('2009-07-30 04:17:52') AS STRING) >= 2009-07-30 04:17:52):boolean>
struct<(to_date('2009-07-30 04:17:52') >= CAST(2009-07-30 04:17:52 AS DATE)):boolean>
-- !query 17 output
false
true


-- !query 18
Expand Down Expand Up @@ -197,9 +197,9 @@ false
-- !query 24
select to_date('2009-07-30 04:17:52') < '2009-07-30 04:17:52'
-- !query 24 schema
struct<(CAST(to_date('2009-07-30 04:17:52') AS STRING) < 2009-07-30 04:17:52):boolean>
struct<(to_date('2009-07-30 04:17:52') < CAST(2009-07-30 04:17:52 AS DATE)):boolean>
-- !query 24 output
true
false


-- !query 25
Expand Down Expand Up @@ -253,7 +253,7 @@ true
-- !query 31
select to_date('2009-07-30 04:17:52') <= '2009-07-30 04:17:52'
-- !query 31 schema
struct<(CAST(to_date('2009-07-30 04:17:52') AS STRING) <= 2009-07-30 04:17:52):boolean>
struct<(to_date('2009-07-30 04:17:52') <= CAST(2009-07-30 04:17:52 AS DATE)):boolean>
-- !query 31 output
true

Expand Down