Mixing
What does 'col (with tick) expression mean in Spark SQL?
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The following syntax:
def func0(x: Int => Int, y: Int)(in: DataFrame): DataFrame = {
in.filter('col > x(y))
}
Cannot place the 'col. "col" does not work, whereas "col" does work in the following code fine:
def func1(x: Int)(in: DataFrame): DataFrame = {
in.selectExpr("col", s"col + $x as col1")
}
The 'col signifies?
The dataframe example only has one col, col, what if 2 or 3 cols? Clearly missing something here. Something tells me it is very simple.
scala apache-spark apache-spark-sql
edited Jan 3 at 18:03
Jacek Laskowski
46.5k18138278
asked Jan 3 at 11:55
thebluephantomthebluephantom
3,32641033
add a comment |
The following syntax:
def func0(x: Int => Int, y: Int)(in: DataFrame): DataFrame = {
in.filter('col > x(y))
}
Cannot place the 'col. "col" does not work, whereas "col" does work in the following code fine:
def func1(x: Int)(in: DataFrame): DataFrame = {
in.selectExpr("col", s"col + $x as col1")
}
The 'col signifies?
The dataframe example only has one col, col, what if 2 or 3 cols? Clearly missing something here. Something tells me it is very simple.
scala apache-spark apache-spark-sql
edited Jan 3 at 18:03
Jacek Laskowski
46.5k18138278
asked Jan 3 at 11:55
thebluephantomthebluephantom
3,32641033
See also stackoverflow.com/q/918590/2093695
– Brian McCutchon
Jan 4 at 0:16
Not the same thing I think though?
– thebluephantom
Jan 4 at 0:29
add a comment |
The following syntax:
def func0(x: Int => Int, y: Int)(in: DataFrame): DataFrame = {
in.filter('col > x(y))
}
Cannot place the 'col. "col" does not work, whereas "col" does work in the following code fine:
def func1(x: Int)(in: DataFrame): DataFrame = {
in.selectExpr("col", s"col + $x as col1")
}
The 'col signifies?
The dataframe example only has one col, col, what if 2 or 3 cols? Clearly missing something here. Something tells me it is very simple.
scala apache-spark apache-spark-sql
edited Jan 3 at 18:03
Jacek Laskowski
46.5k18138278
asked Jan 3 at 11:55
thebluephantomthebluephantom
3,32641033
The following syntax:
def func0(x: Int => Int, y: Int)(in: DataFrame): DataFrame = {
in.filter('col > x(y))
}
Cannot place the 'col. "col" does not work, whereas "col" does work in the following code fine:
def func1(x: Int)(in: DataFrame): DataFrame = {
in.selectExpr("col", s"col + $x as col1")
}
The 'col signifies?
The dataframe example only has one col, col, what if 2 or 3 cols? Clearly missing something here. Something tells me it is very simple.
scala apache-spark apache-spark-sql
scala apache-spark apache-spark-sql
edited Jan 3 at 18:03
Jacek Laskowski
46.5k18138278
asked Jan 3 at 11:55
thebluephantomthebluephantom
3,32641033
edited Jan 3 at 18:03
Jacek Laskowski
46.5k18138278
asked Jan 3 at 11:55
thebluephantomthebluephantom
3,32641033
edited Jan 3 at 18:03
Jacek Laskowski
46.5k18138278
edited Jan 3 at 18:03
Jacek Laskowski
46.5k18138278
edited Jan 3 at 18:03
Jacek Laskowski
46.5k18138278
46.5k18138278
asked Jan 3 at 11:55
thebluephantomthebluephantom
3,32641033
asked Jan 3 at 11:55
thebluephantomthebluephantom
3,32641033
asked Jan 3 at 11:55
thebluephantomthebluephantom
3,32641033
3,32641033
See also stackoverflow.com/q/918590/2093695
– Brian McCutchon
Jan 4 at 0:16
Not the same thing I think though?
– thebluephantom
Jan 4 at 0:29
add a comment |
See also stackoverflow.com/q/918590/2093695
– Brian McCutchon
Jan 4 at 0:16
Not the same thing I think though?
– thebluephantom
Jan 4 at 0:29
See also stackoverflow.com/q/918590/2093695
– Brian McCutchon
Jan 4 at 0:16
See also stackoverflow.com/q/918590/2093695
– Brian McCutchon
Jan 4 at 0:16
Not the same thing I think though?
– thebluephantom
Jan 4 at 0:29
Not the same thing I think though?
– thebluephantom
Jan 4 at 0:29
add a comment |
1 Answer
1
active
oldest
votes
'col is a way to refer to a column named col, same as $"col" or col("col") It's a bit confusing to have a column named col.
It's working for me in spark 2.3
EXAMPLE WITH A COLUMN NAMED NUMBER
df.show
+------+------+
|letter|number|
+------+------+
| a| 1|
| b| 2|
+------+------+
df.filter('number >1).show
+------+------+
|letter|number|
+------+------+
| b| 2|
+------+------+
Same with the other expressions
import spark.implicits._
df.filter($"number" >1).show
import org.apache.spark.sql.functions
df.filter(col("number") >1).show
edited Jan 3 at 18:02
Jacek Laskowski
46.5k18138278
answered Jan 3 at 12:35
SCoutoSCouto
4,10031428
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
'col is a way to refer to a column named col, same as $"col" or col("col") It's a bit confusing to have a column named col.
It's working for me in spark 2.3
EXAMPLE WITH A COLUMN NAMED NUMBER
df.show
+------+------+
|letter|number|
+------+------+
| a| 1|
| b| 2|
+------+------+
df.filter('number >1).show
+------+------+
|letter|number|
+------+------+
| b| 2|
+------+------+
Same with the other expressions
import spark.implicits._
df.filter($"number" >1).show
import org.apache.spark.sql.functions
df.filter(col("number") >1).show
edited Jan 3 at 18:02
Jacek Laskowski
46.5k18138278
answered Jan 3 at 12:35
SCoutoSCouto
4,10031428
add a comment |
'col is a way to refer to a column named col, same as $"col" or col("col") It's a bit confusing to have a column named col.
It's working for me in spark 2.3
EXAMPLE WITH A COLUMN NAMED NUMBER
df.show
+------+------+
|letter|number|
+------+------+
| a| 1|
| b| 2|
+------+------+
df.filter('number >1).show
+------+------+
|letter|number|
+------+------+
| b| 2|
+------+------+
Same with the other expressions
import spark.implicits._
df.filter($"number" >1).show
import org.apache.spark.sql.functions
df.filter(col("number") >1).show
edited Jan 3 at 18:02
Jacek Laskowski
46.5k18138278
answered Jan 3 at 12:35
SCoutoSCouto
4,10031428
add a comment |
'col is a way to refer to a column named col, same as $"col" or col("col") It's a bit confusing to have a column named col.
It's working for me in spark 2.3
EXAMPLE WITH A COLUMN NAMED NUMBER
df.show
+------+------+
|letter|number|
+------+------+
| a| 1|
| b| 2|
+------+------+
df.filter('number >1).show
+------+------+
|letter|number|
+------+------+
| b| 2|
+------+------+
Same with the other expressions
import spark.implicits._
df.filter($"number" >1).show
import org.apache.spark.sql.functions
df.filter(col("number") >1).show
edited Jan 3 at 18:02
Jacek Laskowski
46.5k18138278
answered Jan 3 at 12:35
SCoutoSCouto
4,10031428
'col is a way to refer to a column named col, same as $"col" or col("col") It's a bit confusing to have a column named col.
It's working for me in spark 2.3
EXAMPLE WITH A COLUMN NAMED NUMBER
df.show
+------+------+
|letter|number|
+------+------+
| a| 1|
| b| 2|
+------+------+
df.filter('number >1).show
+------+------+
|letter|number|
+------+------+
| b| 2|
+------+------+
Same with the other expressions
import spark.implicits._
df.filter($"number" >1).show
import org.apache.spark.sql.functions
df.filter(col("number") >1).show
edited Jan 3 at 18:02
Jacek Laskowski
46.5k18138278
answered Jan 3 at 12:35
SCoutoSCouto
4,10031428
edited Jan 3 at 18:02
Jacek Laskowski
46.5k18138278
edited Jan 3 at 18:02
Jacek Laskowski
46.5k18138278
edited Jan 3 at 18:02
Jacek Laskowski
46.5k18138278
46.5k18138278
answered Jan 3 at 12:35
SCoutoSCouto
4,10031428
answered Jan 3 at 12:35
SCoutoSCouto
4,10031428
answered Jan 3 at 12:35
SCoutoSCouto
4,10031428
4,10031428
add a comment |
add a comment |
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See also stackoverflow.com/q/918590/2093695
– Brian McCutchon
Jan 4 at 0:16
Not the same thing I think though?
– thebluephantom
Jan 4 at 0:29