本文整理了Java中com.facebook.presto.sql.tree.QuerySpecification.getFrom方法的一些代码示例，展示了QuerySpecification.getFrom的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。QuerySpecification.getFrom方法的具体详情如下：
包路径：com.facebook.presto.sql.tree.QuerySpecification
类名称：QuerySpecification
方法名：getFrom

QuerySpecification.getFrom介绍

暂无

代码示例

代码示例来源：origin: prestodb/presto

private Scope analyzeFrom(QuerySpecification node, Optional<Scope> scope)
{
  if (node.getFrom().isPresent()) {
    return process(node.getFrom().get(), scope);
  }
  return createScope(scope);
}

代码示例来源：origin: prestodb/presto

private PlanBuilder planFrom(QuerySpecification node)
{
  RelationPlan relationPlan;
  if (node.getFrom().isPresent()) {
    relationPlan = new RelationPlanner(analysis, symbolAllocator, idAllocator, lambdaDeclarationToSymbolMap, metadata, session)
        .process(node.getFrom().get(), null);
  }
  else {
    relationPlan = planImplicitTable();
  }
  return planBuilderFor(relationPlan);
}

代码示例来源：origin: prestodb/presto

if (node.getFrom().isPresent()) {
  append(indent, "FROM");
  builder.append('\n');
  append(indent, "  ");
  process(node.getFrom().get(), indent);

代码示例来源：origin: prestodb/presto

@Override
protected R visitQuerySpecification(QuerySpecification node, C context)
{
  process(node.getSelect(), context);
  if (node.getFrom().isPresent()) {
    process(node.getFrom().get(), context);
  }
  if (node.getWhere().isPresent()) {
    process(node.getWhere().get(), context);
  }
  if (node.getGroupBy().isPresent()) {
    process(node.getGroupBy().get(), context);
  }
  if (node.getHaving().isPresent()) {
    process(node.getHaving().get(), context);
  }
  if (node.getOrderBy().isPresent()) {
    process(node.getOrderBy().get(), context);
  }
  return null;
}

代码示例来源：origin: prestodb/presto

@Override
protected Node visitShowStats(ShowStats node, Void context)
{
  checkState(queryExplainer.isPresent(), "Query explainer must be provided for SHOW STATS SELECT");
  if (node.getRelation() instanceof TableSubquery) {
    Query query = ((TableSubquery) node.getRelation()).getQuery();
    QuerySpecification specification = (QuerySpecification) query.getQueryBody();
    Plan plan = queryExplainer.get().getLogicalPlan(session, new Query(Optional.empty(), specification, Optional.empty(), Optional.empty()), parameters, warningCollector);
    validateShowStatsSubquery(node, query, specification, plan);
    Table table = (Table) specification.getFrom().get();
    Constraint<ColumnHandle> constraint = getConstraint(plan);
    return rewriteShowStats(node, table, constraint);
  }
  else if (node.getRelation() instanceof Table) {
    Table table = (Table) node.getRelation();
    return rewriteShowStats(node, table, Constraint.alwaysTrue());
  }
  else {
    throw new IllegalArgumentException("Expected either TableSubquery or Table as relation");
  }
}

代码示例来源：origin: prestodb/presto

innerQuery = new QuerySpecification(
    querySpecification.getSelect(),
    querySpecification.getFrom(),
    querySpecification.getWhere(),
    querySpecification.getGroupBy(),

代码示例来源：origin: prestodb/presto

private void validateShowStatsSubquery(ShowStats node, Query query, QuerySpecification querySpecification, Plan plan)
{
  // The following properties of SELECT subquery are required:
  //  - only one relation in FROM
  //  - only predicates that can be pushed down can be in the where clause
  //  - no group by
  //  - no having
  //  - no set quantifier
  Optional<FilterNode> filterNode = searchFrom(plan.getRoot())
      .where(FilterNode.class::isInstance)
      .findSingle();
  check(!filterNode.isPresent(), node, "Only predicates that can be pushed down are supported in the SHOW STATS WHERE clause");
  check(querySpecification.getFrom().isPresent(), node, "There must be exactly one table in query passed to SHOW STATS SELECT clause");
  check(querySpecification.getFrom().get() instanceof Table, node, "There must be exactly one table in query passed to SHOW STATS SELECT clause");
  check(!query.getWith().isPresent(), node, "WITH is not supported by SHOW STATS SELECT clause");
  check(!querySpecification.getOrderBy().isPresent(), node, "ORDER BY is not supported in SHOW STATS SELECT clause");
  check(!querySpecification.getLimit().isPresent(), node, "LIMIT is not supported by SHOW STATS SELECT clause");
  check(!querySpecification.getHaving().isPresent(), node, "HAVING is not supported in SHOW STATS SELECT clause");
  check(!querySpecification.getGroupBy().isPresent(), node, "GROUP BY is not supported in SHOW STATS SELECT clause");
  check(!querySpecification.getSelect().isDistinct(), node, "DISTINCT is not supported by SHOW STATS SELECT clause");
  List<SelectItem> selectItems = querySpecification.getSelect().getSelectItems();
  check(selectItems.size() == 1 && selectItems.get(0) instanceof AllColumns, node, "Only SELECT * is supported in SHOW STATS SELECT clause");
}

代码示例来源：origin: prestodb/presto

if (node.getFrom().isPresent()) {
  print(indentLevel, "From");
  process(node.getFrom().get(), indentLevel + 1);

代码示例来源：origin: prestodb/presto

throw new SemanticException(MISSING_TABLE, item, "Table '%s' not found", starPrefix.get());
if (!node.getFrom().isPresent()) {
  throw new SemanticException(WILDCARD_WITHOUT_FROM, item, "SELECT * not allowed in queries without FROM clause");

代码示例来源：origin: prestodb/presto

getLocation(context),
query.getSelect(),
query.getFrom(),
query.getWhere(),
query.getGroupBy(),

代码示例来源：origin: rakam-io/rakam

@Override
protected Void visitQuerySpecification(QuerySpecification node, Integer indent) {
  process(node.getSelect(), indent);
  if (node.getFrom().isPresent()) {
    append(indent, "FROM");
    builder.append('\n');
    append(indent, "  ");
    process(node.getFrom().get(), indent);
  }
  builder.append('\n');
  if (node.getWhere().isPresent()) {
    append(indent, "WHERE " + formatExpression(node.getWhere().get(), tableNameMapper, columnNameMapper, queryWithTables, escapeIdentifier))
        .append('\n');
  }
  if (node.getGroupBy().isPresent()) {
    append(indent, "GROUP BY " + (node.getGroupBy().get().isDistinct() ? " DISTINCT " : "") + formatGroupBy(node.getGroupBy().get().getGroupingElements())).append('\n');
  }
  if (node.getHaving().isPresent()) {
    append(indent, "HAVING " + formatExpression(node.getHaving().get(), tableNameMapper, columnNameMapper, queryWithTables, escapeIdentifier))
        .append('\n');
  }
  if (node.getOrderBy().isPresent()) {
    process(node.getOrderBy().get(), indent);
  }
  if (node.getLimit().isPresent()) {
    append(indent, "LIMIT " + node.getLimit().get())
        .append('\n');
  }
  return null;
}

代码示例来源：origin: uk.co.nichesolutions.presto/presto-main

private RelationType analyzeFrom(QuerySpecification node, AnalysisContext context)
{
  RelationType fromDescriptor = new RelationType();
  if (node.getFrom().isPresent()) {
    fromDescriptor = process(node.getFrom().get(), context);
  }
  return fromDescriptor;
}

代码示例来源：origin: stackoverflow.com

public class PrestoParserTest {
  public static void main(String[] args) {
    SqlParser parser = new SqlParser();
    String sql = "select * from xyz where x=y group by x order by y limit 10";
    Query query = (Query)parser.createStatement(sql);
    QuerySpecification body = (QuerySpecification)query.getQueryBody();
    Select select = body.getSelect();
    System.out.println("Columns = " + select.getSelectItems());
    System.out.println("From = " + body.getFrom().get());
    Optional<Expression> where = body.getWhere();
    System.out.println("Where = " + where.get());
    System.out.println("Group by = " + body.getGroupBy());
    System.out.println("Order by = " + body.getOrderBy());
    System.out.println("Limit = " + body.getLimit().get());

  }
}

代码示例来源：origin: com.facebook.presto/presto-parser

@Override
protected R visitQuerySpecification(QuerySpecification node, C context)
{
  process(node.getSelect(), context);
  if (node.getFrom().isPresent()) {
    process(node.getFrom().get(), context);
  }
  if (node.getWhere().isPresent()) {
    process(node.getWhere().get(), context);
  }
  if (node.getGroupBy().isPresent()) {
    process(node.getGroupBy().get(), context);
  }
  if (node.getHaving().isPresent()) {
    process(node.getHaving().get(), context);
  }
  if (node.getOrderBy().isPresent()) {
    process(node.getOrderBy().get(), context);
  }
  return null;
}

代码示例来源：origin: vqtran/EchoQuery

if (node.getFrom().isPresent()) {
  append(indent, "FROM");
  builder.append('\n');
  append(indent, "  ");
  process(node.getFrom().get(), indent);

代码示例来源：origin: uk.co.nichesolutions.presto/presto-main

private PlanBuilder planFrom(QuerySpecification node)
{
  RelationPlan relationPlan;
  if (node.getFrom().isPresent()) {
    relationPlan = new RelationPlanner(analysis, symbolAllocator, idAllocator, metadata, session)
        .process(node.getFrom().get(), null);
  }
  else {
    relationPlan = planImplicitTable();
  }
  TranslationMap translations = new TranslationMap(relationPlan, analysis);
  // Make field->symbol mapping from underlying relation plan available for translations
  // This makes it possible to rewrite FieldOrExpressions that reference fields from the FROM clause directly
  translations.setFieldMappings(relationPlan.getOutputSymbols());
  return new PlanBuilder(translations, relationPlan.getRoot(), relationPlan.getSampleWeight());
}

代码示例来源：origin: uk.co.nichesolutions.presto/presto-parser

if (node.getFrom().isPresent()) {
  append(indent, "FROM");
  builder.append('\n');
  append(indent, "  ");
  process(node.getFrom().get(), indent);

代码示例来源：origin: com.facebook.presto/presto-parser

if (node.getFrom().isPresent()) {
  append(indent, "FROM");
  builder.append('\n');
  append(indent, "  ");
  process(node.getFrom().get(), indent);

代码示例来源：origin: uk.co.nichesolutions.presto/presto-parser

@Override
protected R visitQuerySpecification(QuerySpecification node, C context)
{
  process(node.getSelect(), context);
  if (node.getFrom().isPresent()) {
    process(node.getFrom().get(), context);
  }
  if (node.getWhere().isPresent()) {
    process(node.getWhere().get(), context);
  }
  if (node.getGroupBy().isPresent()) {
    for (GroupingElement groupingElement : node.getGroupBy().get().getGroupingElements()) {
      process(groupingElement, context);
    }
  }
  if (node.getHaving().isPresent()) {
    process(node.getHaving().get(), context);
  }
  for (SortItem sortItem : node.getOrderBy()) {
    process(sortItem, context);
  }
  return null;
}

代码示例来源：origin: Anchormen/sql4es

if(!(queryBody instanceof QuerySpecification)) throw new SQLException("Statement does not contain expected query specifiction");
QuerySpecification querySpec = (QuerySpecification)queryBody;
if(!querySpec.getFrom().isPresent()) throw new SQLException("Add atleast one INDEX to the query to create the view from");
List<QuerySource> relations = new RelationParser().process(querySpec.getFrom().get(), null);
String[] indices = new String[relations.size()];
for(int i=0; i<relations.size(); i++) indices[i] = relations.get(i).getSource();