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Original file line number Diff line number Diff line change
@@ -0,0 +1,26 @@
package org.apache.spark.sql.jdbc

import java.util.Locale

import org.apache.spark.sql.types.{DataType, MetadataBuilder}

private case object HiveDialect extends JdbcDialect {

override def canHandle(url : String): Boolean =
url.toLowerCase(Locale.ROOT).startsWith("jdbc:hive")

override def getCatalystType(
sqlType: Int, typeName: String, size: Int, md: MetadataBuilder): Option[DataType] = {
None
}

override def quoteIdentifier(colName: String): String = {
colName
}

override def getTableExistsQuery(table: String): String = {
s"SELECT 1 FROM $table LIMIT 1"
}

override def isCascadingTruncateTable(): Option[Boolean] = Some(false)
}
Original file line number Diff line number Diff line change
Expand Up @@ -224,6 +224,7 @@ object JdbcDialects {
registerDialect(DerbyDialect)
registerDialect(OracleDialect)
registerDialect(TeradataDialect)
registerDialect(HiveDialect)

/**
* Fetch the JdbcDialect class corresponding to a given database url.
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Original file line number Diff line number Diff line change
Expand Up @@ -716,6 +716,7 @@ class JDBCSuite extends QueryTest
assert(JdbcDialects.get("jdbc:db2://127.0.0.1/db") == DB2Dialect)
assert(JdbcDialects.get("jdbc:sqlserver://127.0.0.1/db") == MsSqlServerDialect)
assert(JdbcDialects.get("jdbc:derby:db") == DerbyDialect)
assert(JdbcDialects.get("jdbc:hive2://127.0.0.1/db") == HiveDialect)
assert(JdbcDialects.get("test.invalid") == NoopDialect)
}

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