tech.mlsql.indexer.impl.MLSQLSQLDialect.scala Maven / Gradle / Ivy

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package tech.mlsql.indexer.impl

import java.sql.Connection

import org.apache.spark.sql.catalyst.sqlgenerator.SQLDialect
import org.apache.spark.sql.execution.LogicalRDD
import org.apache.spark.sql.execution.datasources.LogicalRelation
import tech.mlsql.sqlbooster.meta.ViewCatalyst

/**
 * 22/12/2020 WilliamZhu([email protected])
 */
class MLSQLSQLDialect extends SQLDialect {
  override def canHandle(url: String): Boolean = url.toLowerCase().startsWith("jdbc:mysql")

  override def quote(name: String): String = {
    "`" + name.replace("`", "``") + "`"
  }

  override def explainSQL(sql: String): String = s"EXPLAIN $sql"

  override def relation(alias: String, relation: LogicalRelation): String = {
    val temp = ViewCatalyst.meta.getTableNameByViewName(alias).path
    s"${alias}"

  }

  override def relation2(alias: String, relation: LogicalRDD): String = {
    val temp = ViewCatalyst.meta.getTableNameByViewName(alias).path
    s"${alias}"
  }

  override def maybeQuote(name: String): String = {
    name
  }

  override def getIndexes(conn: Connection, url: String, tableName: String): Set[String] = {
    Set()
  }

  override def getTableStat(conn: Connection, url: String, tableName: String): (Option[BigInt], Option[Long]) = {
    (None, None)
  }

  override def enableCanonicalize: Boolean = false


}