Spark SQL - Escape Query String

I can't believe I am asking this but...

HOW DO YOU ESCAPE A SQL QUERY STRING IN SPARK SQL USING SCALA?

I have tired everything and searched everywhere. I thought the apache commons library would do it but no luck:

import org.apache.commons.lang.StringEscapeUtils

var sql = StringEscapeUtils.escapeSql("'Ulmus_minor_'Toledo'");

df.filter("topic = '" + sql + "'").map(_.getValuesMap[Any](List("hits","date"))).collect().foreach(println);

returns the following:

topic = '''Ulmus_minor_''Toledo''' ^ at scala.sys.package$.error(package.scala:27) at org.apache.spark.sql.catalyst.SqlParser.parseExpression(SqlParser.scala:45) at org.apache.spark.sql.DataFrame.filter(DataFrame.scala:651) at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.(:29) at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.(:34) at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.(:36) at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC.(:38) at $iwC$$iwC$$iwC$$iwC$$iwC.(:40) at $iwC$$iwC$$iwC$$iwC.(:42) at $iwC$$iwC$$iwC.(:44) at $iwC$$iwC.(:46) at $iwC.(:48) at (:50) at .(:54) at .() at .(:7) at .() at $print() at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at org.apache.spark.repl.SparkIMain$ReadEvalPrint.call(SparkIMain.scala:1065) at org.apache.spark.repl.SparkIMain$Request.loadAndRun(SparkIMain.scala:1338) at org.apache.spark.repl.SparkIMain.loadAndRunReq$1(SparkIMain.scala:840) at org.apache.spark.repl.SparkIMain.interpret(SparkIMain.scala:871) at org.apache.spark.repl.SparkIMain.interpret(SparkIMain.scala:819) at org.apache.spark.repl.SparkILoop.reallyInterpret$1(SparkILoop.scala:857) at org.apache.spark.repl.SparkILoop.interpretStartingWith(SparkILoop.scala:902) at org.apache.spark.repl.SparkILoop.command(SparkILoop.scala:814) at org.apache.spark.repl.SparkILoop.processLine$1(SparkILoop.scala:657) at org.apache.spark.repl.SparkILoop.innerLoop$1(SparkILoop.scala:665) at org.apache.spark.repl.SparkILoop.org$apache$spark$repl$SparkILoop$$loop(SparkILoop.scala:670) at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply$mcZ$sp(SparkILoop.scala:997) at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply(SparkILoop.scala:945) at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply(SparkILoop.scala:945) at scala.tools.nsc.util.ScalaClassLoader$.savingContextLoader(ScalaClassLoader.scala:135) at org.apache.spark.repl.SparkILoop.org$apache$spark$repl$SparkILoop$$process(SparkILoop.scala:945) at org.apache.spark.repl.SparkILoop.process(SparkILoop.scala:1059) at org.apache.spark.repl.Main$.main(Main.scala:31) at org.apache.spark.repl.Main.main(Main.scala) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:665) at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:170) at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:193) at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:112) at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)

Help would be great.

回答1:

It may be surprising but:

var sql = "'Ulmus_minor_'Toledo'"
df.filter(s"""topic = "$sql"""")

works just fine, although it would be much cleaner to use this:

df.filter($"topic" <=> sql)

回答2:

The title of the question is about escaping strings in SparkSQL generally, so there may be a benefit to providing an answer that works for any string, regardless of how it is used in an expression.

def sqlEscape(s: String) = 
  org.apache.spark.sql.catalyst.expressions.Literal(s).sql

sqlEscape("'Ulmus_minor_'Toledo' and \"om\"")
res0: String = '\'Ulmus_minor_\'Toledo\' and "om"'