cfmcgrady commented on code in PR #2620: URL: https://github.com/apache/incubator-kyuubi/pull/2620#discussion_r869043891
########## extensions/spark/kyuubi-extension-spark-3-3/src/main/scala/org/apache/kyuubi/sql/KyuubiSparkSQLParser.scala: ########## @@ -0,0 +1,134 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.apache.kyuubi.sql + +import org.antlr.v4.runtime._ +import org.antlr.v4.runtime.atn.PredictionMode +import org.antlr.v4.runtime.misc.{Interval, ParseCancellationException} +import org.apache.spark.sql.AnalysisException +import org.apache.spark.sql.catalyst.{FunctionIdentifier, TableIdentifier} +import org.apache.spark.sql.catalyst.expressions.Expression +import org.apache.spark.sql.catalyst.parser.{ParseErrorListener, ParseException, ParserInterface, PostProcessor} +import org.apache.spark.sql.catalyst.plans.logical.LogicalPlan +import org.apache.spark.sql.catalyst.trees.Origin +import org.apache.spark.sql.types.{DataType, StructType} + +abstract class KyuubiSparkSQLParserBase extends ParserInterface { + def delegate: ParserInterface + def astBuilder: KyuubiSparkSQLAstBuilderBase + + override def parsePlan(sqlText: String): LogicalPlan = parse(sqlText) { parser => + astBuilder.visit(parser.singleStatement()) match { + case plan: LogicalPlan => plan + case _ => delegate.parsePlan(sqlText) + } + } + + protected def parse[T](command: String)(toResult: KyuubiSparkSQLParser => T): T = { + val lexer = new KyuubiSparkSQLLexer( + new UpperCaseCharStream(CharStreams.fromString(command))) + lexer.removeErrorListeners() + lexer.addErrorListener(ParseErrorListener) + + val tokenStream = new CommonTokenStream(lexer) + val parser = new KyuubiSparkSQLParser(tokenStream) + parser.addParseListener(PostProcessor) + parser.removeErrorListeners() + parser.addErrorListener(ParseErrorListener) + + try { + try { + // first, try parsing with potentially faster SLL mode + parser.getInterpreter.setPredictionMode(PredictionMode.SLL) + toResult(parser) + } catch { + case _: ParseCancellationException => + // if we fail, parse with LL mode + tokenStream.seek(0) // rewind input stream + parser.reset() + + // Try Again. + parser.getInterpreter.setPredictionMode(PredictionMode.LL) + toResult(parser) + } + } catch { + case e: ParseException if e.command.isDefined => + throw e + case e: ParseException => + throw e.withCommand(command) + case e: AnalysisException => + val position = Origin(e.line, e.startPosition) + throw new ParseException(Option(command), e.message, position, position) + } + } + + override def parseExpression(sqlText: String): Expression = { + delegate.parseExpression(sqlText) + } + + override def parseTableIdentifier(sqlText: String): TableIdentifier = { + delegate.parseTableIdentifier(sqlText) + } + + override def parseFunctionIdentifier(sqlText: String): FunctionIdentifier = { + delegate.parseFunctionIdentifier(sqlText) + } + + override def parseMultipartIdentifier(sqlText: String): Seq[String] = { + delegate.parseMultipartIdentifier(sqlText) + } + + override def parseTableSchema(sqlText: String): StructType = { + delegate.parseTableSchema(sqlText) + } + + override def parseDataType(sqlText: String): DataType = { + delegate.parseDataType(sqlText) + } + + override def parseQuery(sqlText: String): LogicalPlan = { Review Comment: the new abstract function `parseQuery` was added by https://github.com/apache/spark/pull/34543 -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
