Examples with NullInitializerExpressionFactory org.apache.calcite.sql2rel.NullInitializerExpressionFactory used on opensource projects

Example 1 with NullInitializerExpressionFactory

use of org.apache.calcite.sql2rel.NullInitializerExpressionFactory in project calcite by apache.

the class SqlCreateTable method execute.

public void execute(CalcitePrepare.Context context) {
    final Pair<CalciteSchema, String> pair = SqlDdlNodes.schema(context, true, name);
    final JavaTypeFactory typeFactory = new JavaTypeFactoryImpl();
    final RelDataType queryRowType;
    if (query != null) {
        // A bit of a hack: pretend it's a view, to get its row type
        final String sql = query.toSqlString(CalciteSqlDialect.DEFAULT).getSql();
        final ViewTableMacro viewTableMacro = ViewTable.viewMacro(pair.left.plus(), sql, pair.left.path(null), context.getObjectPath(), false);
        final TranslatableTable x = viewTableMacro.apply(ImmutableList.of());
        queryRowType = x.getRowType(typeFactory);
        if (columnList != null && queryRowType.getFieldCount() != columnList.size()) {
            throw SqlUtil.newContextException(columnList.getParserPosition(), RESOURCE.columnCountMismatch());
        }
    } else {
        queryRowType = null;
    }
    final List<SqlNode> columnList;
    if (this.columnList != null) {
        columnList = this.columnList.getList();
    } else {
        if (queryRowType == null) {
            // a list of column names and types, "CREATE TABLE t (INT c)".
            throw SqlUtil.newContextException(name.getParserPosition(), RESOURCE.createTableRequiresColumnList());
        }
        columnList = new ArrayList<>();
        for (String name : queryRowType.getFieldNames()) {
            columnList.add(new SqlIdentifier(name, SqlParserPos.ZERO));
        }
    }
    final ImmutableList.Builder<ColumnDef> b = ImmutableList.builder();
    final RelDataTypeFactory.Builder builder = typeFactory.builder();
    final RelDataTypeFactory.Builder storedBuilder = typeFactory.builder();
    for (Ord<SqlNode> c : Ord.zip(columnList)) {
        if (c.e instanceof SqlColumnDeclaration) {
            final SqlColumnDeclaration d = (SqlColumnDeclaration) c.e;
            final RelDataType type = d.dataType.deriveType(typeFactory, true);
            builder.add(d.name.getSimple(), type);
            if (d.strategy != ColumnStrategy.VIRTUAL) {
                storedBuilder.add(d.name.getSimple(), type);
            }
            b.add(ColumnDef.of(d.expression, type, d.strategy));
        } else if (c.e instanceof SqlIdentifier) {
            final SqlIdentifier id = (SqlIdentifier) c.e;
            if (queryRowType == null) {
                throw SqlUtil.newContextException(id.getParserPosition(), RESOURCE.createTableRequiresColumnTypes(id.getSimple()));
            }
            final RelDataTypeField f = queryRowType.getFieldList().get(c.i);
            final ColumnStrategy strategy = f.getType().isNullable() ? ColumnStrategy.NULLABLE : ColumnStrategy.NOT_NULLABLE;
            b.add(ColumnDef.of(c.e, f.getType(), strategy));
            builder.add(id.getSimple(), f.getType());
            storedBuilder.add(id.getSimple(), f.getType());
        } else {
            throw new AssertionError(c.e.getClass());
        }
    }
    final RelDataType rowType = builder.build();
    final RelDataType storedRowType = storedBuilder.build();
    final List<ColumnDef> columns = b.build();
    final InitializerExpressionFactory ief = new NullInitializerExpressionFactory() {

        @Override
        public ColumnStrategy generationStrategy(RelOptTable table, int iColumn) {
            return columns.get(iColumn).strategy;
        }

        @Override
        public RexNode newColumnDefaultValue(RelOptTable table, int iColumn, InitializerContext context) {
            final ColumnDef c = columns.get(iColumn);
            if (c.expr != null) {
                return context.convertExpression(c.expr);
            }
            return super.newColumnDefaultValue(table, iColumn, context);
        }
    };
    if (pair.left.plus().getTable(pair.right) != null) {
        // Table exists.
        if (!ifNotExists) {
            // They did not specify IF NOT EXISTS, so give error.
            throw SqlUtil.newContextException(name.getParserPosition(), RESOURCE.tableExists(pair.right));
        }
        return;
    }
    // Table does not exist. Create it.
    pair.left.add(pair.right, new MutableArrayTable(pair.right, RelDataTypeImpl.proto(storedRowType), RelDataTypeImpl.proto(rowType), ief));
    if (query != null) {
        SqlDdlNodes.populate(name, query, context);
    }
}